WO2016045532A1 - 用于配置随机接入响应窗的方法以及基站和用户设备 - Google Patents

用于配置随机接入响应窗的方法以及基站和用户设备 Download PDF

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Publication number
WO2016045532A1
WO2016045532A1 PCT/CN2015/089847 CN2015089847W WO2016045532A1 WO 2016045532 A1 WO2016045532 A1 WO 2016045532A1 CN 2015089847 W CN2015089847 W CN 2015089847W WO 2016045532 A1 WO2016045532 A1 WO 2016045532A1
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Prior art keywords
random access
access response
coverage enhancement
different
window
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English (en)
French (fr)
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刘仁茂
王丰
蒋琦
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Sharp Corp
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Sharp Corp
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Priority to CA2959191A priority Critical patent/CA2959191A1/en
Priority to US15/507,518 priority patent/US20170290064A1/en
Priority to EP15844229.3A priority patent/EP3200543B1/en
Publication of WO2016045532A1 publication Critical patent/WO2016045532A1/zh
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal

Definitions

  • the present invention relates to the field of wireless communication technologies, and more particularly, to a method for configuring a random access response window, a base station, and a user equipment.
  • MTC Machine Type Communication
  • LTE Long Term Evolution Project
  • MTC Machine Type Communication
  • MTC is a data communication service that does not require human involvement.
  • Large-scale deployment of MTC user equipment can be used in security, tracking, billing, measurement, and consumer electronics.
  • Applications include video surveillance, supply chain tracking, smart meters, and remote monitoring.
  • MTC requires lower power consumption, supports lower data transmission rates and lower mobility.
  • the current LTE system is mainly aimed at human-to-human communication services.
  • the key to achieving the scale competitive advantage and application prospect of MTC services lies in the fact that LTE networks support low-cost MTC devices.
  • MTC equipment needs to be installed in the basement of the residential building or protected by insulated foil, metal window or thick wall of traditional buildings, compared to conventional equipment terminals (such as mobile phones, tablets, etc.) in LTE networks.
  • the air interface will obviously suffer from more severe penetration losses.
  • 3GPP decided to study the design and performance evaluation of MTC devices with additional 20dB coverage enhancement. It is worth noting that MTC devices located in poor network coverage areas have the following characteristics: very low data transmission rate, very loose latency requirements and limited Mobility.
  • the LTE network can further optimize some signaling and/or channels to better support the MTC service.
  • Non-Patent Document: RP-140990 New Work Item on Even Lower Complexity and Enhanced Coverage LTE UE for MTC, Ericsson, NSN).
  • the LTE Rel-13 system needs to support the uplink and downlink 1.4MHz radio frequency bandwidth of the MTC user equipment (User Equipment, UE, hereinafter referred to as the narrowband MTC UE) to work in any system bandwidth (for example, 1.4MHz, 3MHz). , 5MHz, 10MHz, 15MHz, 20MHz, etc.), and provide coverage enhancement for this type of MTC users.
  • UE User Equipment
  • the eNB when the eNB detects the preamble sequence sent by the UE, the eNB sends a random access response (RAR) on the Physical Downlink Shared CHannel (PDSCH), including: Detected preamble sequence index, time adjustment information for uplink synchronization, initial uplink resource allocation (for transmitting subsequent msg3), and a temporary Cell-Radio Network Temporary Identifier (C-RNTI) .
  • RAR random access response
  • PDSCH Physical Downlink Shared CHannel
  • C-RNTI Cell-Radio Network Temporary Identifier
  • the Random Access-Radio Network Temporary Identifier (RA-RNTI) needs to be used in the random access response window to monitor the Physical Downlink Control CHannel (PDCCH). Receive RAR messages.
  • RA-RNTI Random Access-Radio Network Temporary Identifier
  • RA-RNTI 1+t_id+10*f_id
  • T_id the first subframe index number (0 ⁇ t_id ⁇ 10) of the physical random access channel (PRACH) of the preamble;
  • F_id The frequency domain position index of the PRACH in this subframe (0 ⁇ f_id ⁇ 6). For the FDD system, there is only one frequency domain position. Therefore, f_id is always zero.
  • the RA-RNTI has a one-to-one correspondence with the time-frequency position of the UE transmitting the preamble sequence.
  • the UE and the eNB may calculate the RA-RNTI value corresponding to the preamble sequence, respectively.
  • the UE receives the RAR message according to the calculated RA-RNTI value. If the preamble sequence index in the RAR is the same as the preamble sequence sent by the UE itself, the UE uses the uplink time adjustment information in the RAR and starts a corresponding conflict resolution process.
  • the random access response window starts from a subframe in which the UE transmits the preamble sequence + 3 subframes, and has a length of ra-ResponseWindowSize subframes. See Table 1 for the definition of ra-ResponseWindowSize. If the UE does not receive a reply to its RAR within this time, the access is considered to have failed. In the RAR message, there may also be a backoff indication indicating that the UE retransmits the preamble waiting time range. If an access fails, the UE needs to delay for a period of time before proceeding to the next preamble access. The time range of the delay is indicated by the backoffindicator. The UE may randomly take values between 0 and backoffindicator. This can reduce the probability that a UE that has collided will transmit the preamble again at the same time.
  • an enhancement technique is needed to improve the received signal strength of the MTC UE physical channel.
  • the subframe signal binding or repeated transmission is mainly used to improve the received signal strength of the MTC physical channel.
  • the coverage enhancement of the MTC UEs in different geographical locations may be different.
  • the MTC UEs of the same cell may be divided into multiple different coverage enhancement levels, and the number of repeated transmissions required for different coverage enhancement levels is different.
  • the coverage enhancement level can also be indicated by a repetition level.
  • the PRACH of the coverage enhanced MTC UE may be divided into four repetition levels (0, 1, 2, 3) corresponding to coverage enhancements of 0 dB, 5 dB, 10 dB, and 15 dB, respectively.
  • the time interval between the start of transmission of a certain repetition level and the end of its sub-frame may be referred to as a repetition window. Then, different repeat levels will have different repeat window sizes. For a PRACH repetition window of a certain repetition level, there will be a RAR transmission corresponding to the repetition level.
  • the Rel-13 LTE system supporting the enhanced MTC covers different time granularity of the MTC UE physical channel transmission, and the existing system uses the subframe as the time measurement of one transmission, and the coverage enhancement
  • the time granularity of the physical channel transmission of the MTC is a repeating window. Therefore, for coverage enhanced MTC, it is necessary to reconsider the design of the random access response window covering the enhanced MTC UE.
  • a base station including: a configuration unit configured to configure a random access response window size for random access responses of different coverage enhancement levels; and a transmitting unit configured to use a random access response window A protocol data unit of the medium access control of the random access response is transmitted on a certain repeat window.
  • the random access response window size is expressed by the number of random access response repetition windows. Shown.
  • the configuration unit configures different random access response window sizes for different coverage enhancement levels of the random access response.
  • the configuration unit configures the same random access response window size for different coverage enhancement levels of the random access response.
  • the coverage enhancement levels of different physical random access channels PRACH have the same or different backoff time parameter tables.
  • the unit of measure of the value in the backoff time parameter table is a PRACH repeat window.
  • a user equipment comprising: a receiving unit, an enhanced physical downlink control channel EPDCCH that monitors a random access response on one or more repetition windows within a random access response window (equivalent to M-PDCCH) or a physical downlink shared channel PDSCH; and an extracting unit for reading a random access response window size, wherein the random access window size corresponds to a coverage enhancement level of the random access response.
  • EPDCCH enhanced physical downlink control channel
  • an extracting unit for reading a random access response window size, wherein the random access window size corresponds to a coverage enhancement level of the random access response.
  • the random access response window size is represented by the number of random access response repetition windows.
  • the coverage enhancement levels of different random access responses have different random access response window sizes.
  • the coverage enhancement levels of different random access responses have the same random access response window size.
  • the coverage enhancement levels of different random access responses have the same or different backoff time parameter tables.
  • the unit of measure of the value in the backoff time parameter table is a physical random access channel PRACH repetition window.
  • a method performed by a base station comprising: configuring a random access response window size for random access responses of different coverage enhancement levels; and a repetition within a random access response window A protocol data unit of the media access control of the random access response is sent on the window.
  • the random access response window size is represented by the number of random access response repetition windows.
  • different random access response window sizes are allocated for different physical random access channel PRACH coverage enhancement levels.
  • the same random access response window size is allocated for different physical random access channel PRACH coverage enhancement levels.
  • the different physical random access channel PRACH coverage enhancement levels have the same or different backoff time parameter tables.
  • the unit of measure of the value in the backoff time parameter table is a PRACH repeat window.
  • a method performed by a user equipment comprising: an enhanced physical downlink control channel EPDCCH (MPDCCH) for monitoring a random access response on one or more repetition windows within a random access response window - PDCCH) or a physical downlink shared channel PDSCH; and reading a random access response window size, wherein the random access window size corresponds to a coverage enhancement level of the random access response.
  • MPDCCH enhanced physical downlink control channel
  • the random access response window size is represented by the number of random access response repetition windows.
  • the coverage enhancement levels of different random access responses have different random access response window sizes.
  • the coverage enhancement levels of different random access responses have the same random access response window size.
  • the different physical random access channel PRACH coverage enhancement levels have the same or different backoff time parameter tables.
  • the unit of measure of the value in the backoff time parameter table is a PRACH repeat window.
  • Figure 1 shows a block diagram of a base station in accordance with one embodiment of the present invention.
  • FIG. 2 shows a block diagram of a user equipment in accordance with one embodiment of the present invention.
  • FIG. 3 illustrates a schematic diagram of configuring different random access response window sizes based on different coverage enhancement levels of a repeating window, in accordance with one embodiment of the present invention.
  • FIG. 4 illustrates a schematic diagram of configuring different random access response window sizes based on different coverage enhancement levels of a subframe, in accordance with one embodiment of the present invention.
  • FIG. 5 illustrates a schematic diagram of configuring the same random access response window size based on different coverage enhancement levels of a repeating window, in accordance with one embodiment of the present invention.
  • FIG. 6 shows a schematic diagram of configuring the same random access response window size based on different coverage enhancement levels of subframes, in accordance with one embodiment of the present invention.
  • Figure 7 shows a flow diagram of a method performed by a base station in accordance with one embodiment of the present invention.
  • Figure 8 illustrates a flow diagram of a method performed by a user equipment in accordance with one embodiment of the present invention.
  • Embodiments in accordance with the present invention are specifically described below with the LTE mobile communication system and its subsequent evolved versions as example application environments. However, it should be noted that the present invention is not limited to the following embodiments, but can be applied to more other wireless communication systems, such as future 5G cellular communication systems.
  • FIG. 1 shows a block diagram of a base station 100 in accordance with one embodiment of the present invention.
  • the base station 100 includes a configuration unit 110 and a transmitting unit 120.
  • base station 100 may also include other functional units necessary to implement its functions, such as various processors, memories, and the like. However, a detailed description of these well-known elements has been omitted for the sake of brevity.
  • the configuration unit 110 can configure a random access response window size for random access responses of different coverage enhancement levels.
  • the configuration unit 110 may also configure a backoff indicator for random access responses of different coverage enhancement levels. Further, the configuration unit 110 can configure other configuration information.
  • the random access response window refers to a length of a period of length of ra-ResponseWindowSize subframes starting from a subframe +3 subframes in which the UE transmits the preamble sequence.
  • the physical downlink control channel Physical Downlink Control CHannel, PDCCH
  • PDCCH Physical Downlink Control CHannel
  • the uplink and downlink physical channels need to be repeatedly transmitted multiple times to meet the coverage enhancement requirement of the channel.
  • the degree of channel coverage enhancement required by UEs in different geographical locations is different. It can also be said that the number of repeated transmissions of the physical channels of UEs in different geographical locations is different. Therefore, the degree of coverage enhancement of the physical channel can be divided into several Different coverage enhancement levels.
  • the physical channels of different coverage enhancement levels require different numbers of repeated transmissions.
  • the hierarchical physical random access channel PRACH can be divided into four coverage enhancement levels (CE0, CE1, CE2, and CE3), and each PRACH coverage enhancement level corresponds to a fixed window length PRACH repetition window. For a physical channel with different coverage enhancement levels, the window length of the repeating window is different.
  • Each coverage enhancement level PRACH has a random access response with its corresponding coverage enhancement level.
  • the random access response of each coverage enhancement level corresponds to a repetition window of a physical downlink shared channel PDSCH carrying a random access response of a fixed window length, or simply a random access response repetition window.
  • each coverage enhancement level random access response corresponds to a fixed window length (E)PDCCH (M-PDCCH) repetition window for scheduling a physical downlink shared channel PDSCH carrying a random access response, or simply Random access response repeat window.
  • each coverage enhancement level random access response corresponds to a fixed window length (E)PDCCH (M-PDCCH) repetition window for scheduling a physical downlink shared channel PDSCH carrying a random access response and the M - PDCCH scheduled PDSCH repetition window, or simply random access response repetition window.
  • E window length
  • M-PDCCH fixed window length
  • the repeat window refers to the time interval between the first transmission to the last retransmission of data and/or signaling transmissions that complete a coverage enhancement level.
  • the random access response repetition window refers to the time interval between the first transmission to the last repeated transmission of the random access response RAR transmission of a certain coverage enhancement level.
  • the random access response RAR transmission includes an (E)PDCCH (M-PDCCH) for scheduling a physical downlink shared channel PDSCH carrying a random access response and a PDSCH scheduled by the M-PDCCH.
  • the repetition window of the physical channel may be represented by the first transmission radio frame number + subframe number of the physical channel and the last transmitted radio frame number + subframe number;
  • the repetition window of the physical channel may be represented by the first transmitted radio frame number + subframe number of the physical channel and the number of repeated transmissions required for the physical channel;
  • the repetition window of the physical channel may be represented by the first transmitted radio frame number + subframe number of the physical channel, the number of repeated transmissions required for the physical channel, and the available subframe indication for the physical channel.
  • the available subframe indication of the physical channel can be implemented by bit mapping, that is, the bit corresponding to a certain subframe. If the bit is 1, it indicates that the subframe can be used for transmission of the physical channel; if the bit is 0, indicating that the subframe cannot be used for transmission of the physical channel.
  • the random access response window of the coverage enhanced MTC UE may be represented by the number of repetition windows or the number of subframes of the Physical Downlink Shared CHannel (PDSCH) carrying the random access response message.
  • the random access response window of the coverage enhanced MTC UE may be used to schedule an (E)PDCCH (M-PDCCH) repetition window of a Physical Downlink Shared CHannel (PDSCH) carrying a random access response message. Represented by the number of numbers or subframes.
  • Table 2 below shows the size of the random access response window by the number of repeated windows.
  • the random access response window at this time may be described as starting from the last subframe + k subframes in which the UE repeatedly transmits the preamble sequence on the physical random access channel, and the length is ra-ResponseWindowSize-MTC repeating windows.
  • K is a constant and can be a preset value or configured by a base station.
  • Table 3 below shows the size of the random access response window in terms of the number of subframes. Unlike existing LTE systems, the value of its subframe needs to be increased.
  • the random access response window at this time may be described as starting from the last subframe + k subframes in which the UE repeatedly transmits the preamble sequence on the physical random access channel, and the length is ra-ResponseWindowSize-MTC subframes. among them.
  • K is a constant and can be a pre-set value or configured by the base station.
  • the base station may configure different or the same random access response window size for random access responses of different coverage enhancement levels (or physical random access channels of different coverage enhancement levels).
  • the base station may also configure different or the same backoff time parameter table for physical coverage access channels (or random access responses of different coverage enhancement levels) of different coverage enhancement levels.
  • the sending unit 120 After receiving the random access preamble sequence sent by the UE, the sending unit 120 repeatedly receives the last sub-end of the preamble sequence on the physical random access channel by the slave base station corresponding to the random access preamble sequence.
  • the frame starts with +k subframes, and the random access response window in the random access response window with the ra-ResponseWindowSize-MTC random access response repetition window repeatedly transmits the media access of the random access response repeatedly.
  • K is a constant, which may be a preset value or configured by a base station;
  • a MAC PDU consists of a MAC header and zero or more MAC random access responses and selectable padding fields;
  • the number of transmissions is determined by the number of repeated transmissions configured for the repetition window of the coverage enhancement level.
  • the sending unit 120 will be the primary base station corresponding to the random access preamble sequence on the physical random access channel or Repeatingly receiving the last subframe of the preamble sequence + the beginning of the k subframes, and the random access in the random access response window of the ra-ResponseWindowSize-MTC subframes
  • a Protocol Data Unit (PDU) MAC PDU of a medium access control (MAC) of the random access response is repeatedly transmitted in response to the repeating window.
  • PDU Protocol Data Unit
  • MAC medium access control
  • K is a constant, which can be a preset value or configured by the base station; n is an integer value whose size is determined by ra-ResponseWindowSize-MTC, the window length of the random access response repeat window, and the adjacent two The interval between random access response repetition windows is determined; one MAC PDU consists of one MAC header and zero or more MAC random access responses and selectable padding fields; the specific number of repeated transmissions is the coverage The number of repeated transmissions configured by the repeating window of the enhanced level is determined.
  • FIG. 2 shows a block diagram of a UE 200 in accordance with one embodiment of the present invention.
  • the UE 200 includes a receiving unit 210 and an extracting unit 220.
  • the UE 200 may also include other functional units necessary to implement its functions, such as various processors, memories, and the like. However, a detailed description of these well-known elements has been omitted for the sake of brevity.
  • the slave UE corresponding to the random access preamble sequence repeats the transmission of the preamble sequence one or more times on the physical random access channel.
  • the sub-frame + k subframes start, and the ra-ResponseWindowSize-MTC random access response window in the random access response window with the ra-ResponseWindowSize-MTC random access response repetition window monitors the random access response on the repeated window ( E) PDCCH (M-PDCCH) or PDSCH.
  • K is a constant, which may be a preset value or configured by a base station;
  • a MAC PDU consists of a MAC header and zero or more MAC random access responses and selectable padding fields;
  • the number of transmissions is determined by the number of repeated transmissions configured for the repetition window of the coverage enhancement level.
  • the (E)PDCCH refers to an (E)PDCCH (M-PDCCH) for scheduling a PDSCH carrying a random access response message.
  • the (E)PDCCH may be an EPDCCH defined by an existing LTE system or a newly designed narrowband PDCCH (M-PDCCH).
  • the PDSCH is a PDSCH carrying a random access response message without (E)PDCCH (M-PDCCH) scheduling.
  • E E
  • M-PDCCH random access response message without (E)PDCCH
  • the UE directly monitors the PDSCH carrying the random access response message.
  • the slave UE corresponding to the random access preamble sequence repeats the transmission of the preamble sequence one or more times on the physical random access channel.
  • E PDCCH (M-PDCCH) on which the random access response is monitored on the n random access response repetition windows in the random access response window of the length of the ra-ResponseWindowSize-MTC subframes starting with the last subframe + k subframes ) or PDSCH.
  • K is a constant, which can be a preset value or configured by the base station; n is an integer value whose size is determined by ra-ResponseWindowSize-MTC, the window length of the random access response repeat window, and the adjacent two The interval between random access response repetition windows is determined; one MAC PDU consists of one MAC header and zero or more MAC random access responses and selectable padding fields; the specific number of repeated transmissions is the coverage The number of repeated transmissions configured by the repeating window of the enhanced level is determined.
  • the (E)PDCCH refers to an (E)PDCCH (M-PDCCH) for scheduling a PDSCH carrying a random access response message.
  • the (E)PDCCH may be an EPDCCH defined by an existing LTE system or a newly designed narrowband PDCCH (M-PDCCH).
  • the PDSCH is a PDSCH carrying a random access response message without (E)PDCCH (M-PDCCH) scheduling.
  • E E
  • M-PDCCH random access response message without (E)PDCCH
  • the UE directly monitors the PDSCH carrying the random access response message.
  • the UE reads the configuration information of the size of the random access response window and/or the back indication information according to the coverage enhancement level of the random access response of the UE.
  • the UE reads the size of the random access window and the configuration information of the back indication information according to the coverage enhancement level of the PRACH of the random access preamble sequence sent by the UE.
  • the PRACH is divided into four coverage enhancement levels (CE0, CE1, CE2, and CE3), and each coverage enhancement level corresponds to a fixed window length PRACH repetition window.
  • Each coverage enhancement level PRACH has a random access response with its corresponding coverage enhancement level.
  • Each coverage enhancement level random access response corresponds to a repeat window of a fixed window length random access response.
  • the base station 100 can be a random access response with different coverage enhancement levels (or different coverage enhancements)
  • a strong level of physical random access channel configures different random access response window sizes.
  • the random access response window size refers to the number of random access response repetition windows.
  • the random access response window size configured by the base station 100 for the random access response coverage enhancement level CE0 is 10 (ie, 10 random access response repetition windows of the coverage enhancement level).
  • CE1 is 5 (that is, 5 random access response repetition windows of the coverage enhancement level)
  • CE2 is 3 (that is, 3 random access response repetition windows of the coverage enhancement level)
  • CE3 is 2 (ie, 2)
  • the coverage enhancement level random access response repeat window is 2 (ie, 2) The coverage enhancement level random access response repeat window).
  • the configuration information of the random access response window size may be notified to the MTC UE in a preset manner, or through MIB or SIBx or MAC PDU or dedicated RRC signaling.
  • the MIB is a Master Information Block (MIB)
  • the SIB is a System Information Block (SIB)
  • the SIBx is SIB1 and/or SIB2 and/or other SIBs.
  • the PRACH is divided into four coverage enhancement levels (CE0, CE1, CE2, and CE3), and each coverage enhancement level corresponds to a fixed window length PRACH repetition window.
  • Each coverage enhancement level PRACH has a random access response with its corresponding coverage enhancement level.
  • the random access response of each coverage enhancement level corresponds to a random access response repetition window of a fixed window length.
  • the base station 100 can configure different random access response window sizes for random access responses (or physical coverage access channels of different coverage enhancement levels) for different coverage enhancement levels.
  • the random access response window size refers to the number of downlink subframes.
  • the random access response window size configured by the base station 100 for the random access response coverage enhancement level CE0 is 250 (ie, 250 downlink subframes).
  • CE1 is 200 (that is, 200 downlink subframes)
  • CE2 is 150 (that is, 150 downlink subframes)
  • CE3 is 100 (that is, 100 downlink subframes).
  • the configuration information of the random access response window size may be notified to the MTC UE in a preset manner, or through MIB or SIBx or MAC PDU or dedicated RRC signaling.
  • the MIB is a Master Information Block (MIB)
  • the SIB is a System Information Block (SIB)
  • the SIBx is SIB1 and/or SIB2 and/or other SIBs.
  • FIG. 5 illustrates a schematic diagram of configuring the same random access response window size based on different coverage enhancement levels of a repeating window, in accordance with one embodiment of the present invention.
  • the PRACH is divided into four coverage enhancement levels (CE0, CE1, CE2, and CE3), and each coverage enhancement level corresponds to a fixed window length PRACH repetition window.
  • Each coverage enhancement level The PRACH has a random access response with its corresponding coverage enhancement level.
  • the random access response of each coverage enhancement level corresponds to a random access response repetition window of a fixed window length.
  • the base station 100 can configure the same random access response window size for random access responses of different coverage enhancement levels (or physical random access channels of different coverage enhancement levels).
  • the random access response window size refers to the number of random access response repetition windows.
  • the random access response window size configured by the base station 100 for the random access response coverage enhancement level CE0/CE1/CE2/CE3 is 5 (ie, 5 corresponding coverage enhancement level random access response repetition windows).
  • the configuration information of the random access response window size may be notified to the MTC UE in a preset manner, or through MIB or SIBx or MAC PDU or dedicated RRC signaling.
  • the MIB is a Master Information Block (MIB)
  • the SIB is a System Information Block (SIB)
  • the SIBx is SIB1 and/or SIB2 and/or other SIBs.
  • the PRACH is divided into four coverage enhancement levels (CE0, CE1, CE2, and CE3), and each coverage enhancement level corresponds to a fixed window length PRACH repetition window.
  • Each coverage enhancement level PRACH has a random access response with its corresponding coverage enhancement level.
  • the random access response of each coverage enhancement level corresponds to a fixed window length random access response repetition window.
  • the base station 100 can configure the same random access response window size for random access responses of different coverage enhancement levels (or physical random access channels of different coverage enhancement levels).
  • the random access response window size refers to the number of downlink subframes.
  • the random access response window size configured by the base station 100 for the random access response coverage enhancement level CE0/CE1/CE2/CE3 is 200 (ie, 200 downlink subframes).
  • the configuration information of the random access response window size may be notified to the MTC UE in a preset manner, or through MIB or SIBx or MAC PDU or dedicated RRC signaling.
  • the MIB is a Master Information Block (MIB)
  • the SIB is a System Information Block (SIB)
  • the SIBx is SIB1 and/or SIB2 and/or other SIBs.
  • the UE monitors the PDCCH in the random access response window. If a random access response is detected (the corresponding PDCCH is detected by using the RA-RNTI), but the identifier of the random access preamble sequence sent by the UE itself is not detected in the corresponding MAC PDU, but the BackoffIndicator is detected, indicating the preamble Sequence It has been detected by the eNode B, but multiple preamble sequences use the same time-frequency resource to send random access requests (ie, each UE has the same RA-RNTI), and the UE sets the backoff time as the back indication field.
  • the UE randomly selects a delay time from 0 to the back time period, and retransmits the random access preamble sequence.
  • the setting of the back parameter value is measured in milliseconds (subframe) as shown in Table 4 below.
  • the PRACH needs to be repeatedly transmitted multiple times to meet its coverage enhancement level requirements.
  • PRACHs with different coverage enhancement levels have different number of repeated transmissions, that is, the window length of the PRACH repetition window is different.
  • the four PRACH coverage enhancement levels have four different repeat window lengths.
  • the coverage enhanced MTC UE may employ a fallback mechanism similar to the existing LTE system. The specific implementation is as follows:
  • Embodiment 1 As shown in Table 4, the unit of measurement of the parameter value in the back time parameter table is milliseconds (ms).
  • the MTC UEs with different PRACH coverage enhancement levels use the same backoff time parameter table. However, MTC UEs with different PRACH coverage enhancement levels may be configured with the same or different backoff times.
  • the back time parameter table may be a parameter table of the existing LTE system (such as Table 4), or may be a redesigned parameter table.
  • PRACH coverage enhancement level MTC UEs use different backoff time parameter tables.
  • the PRACH coverage enhancement level CE0 uses the existing table (Table 1), and the other coverage enhancement level backoff time parameter tables are redesigned.
  • all PRACH coverage enhancement levels are divided into groups, and different groups of MTC UEs use different backoff time parameter tables.
  • groups of MTC UEs use different backoff time parameter tables.
  • four PRACH coverage enhancement levels are divided into two groups, CE0 and CE1 are group 1, and CE2 and CE3 are group 2.
  • Group 1 and Group 2 use different backoff time parameter tables.
  • Embodiment 2 as shown in Table 5, the unit of measure of the parameter value in the backoff time parameter table is a PRACH repetition window.
  • the MTC UEs with different PRACH coverage enhancement levels use the same backoff time parameter table. However, MTC UEs with different PRACH coverage enhancement levels may be configured with the same or different backoff times.
  • different PRACH coverage enhancement level MTC UEs use different backoff time parameter tables.
  • the back time parameter table of the PRACH coverage enhancement level CE0 is redesigned using Table 5 and the back time parameter table of other coverage enhancement levels.
  • all PRACH coverage enhancement levels are divided into groups, and different groups of MTC UEs use different backoff time parameter tables.
  • groups of MTC UEs use different backoff time parameter tables.
  • four PRACH coverage enhancement levels are divided into two groups, CE0 and CE1 are group 1, and CE2 and CE3 are group 2.
  • Group 1 and Group 2 use different backoff time parameter tables.
  • index Back parameter value (rw) 0 0 1 10 2 20 3 30 4 40 5 60 6 80
  • rw indicates the number of PRACH repeat windows
  • Figure 7 shows a flow diagram of a method performed by a base station in accordance with one embodiment of the present invention. As shown in FIG. 7, method 700 begins at step S710.
  • the base station configures different or the same random access response window size for random access responses of different coverage enhancement levels (or physical random access channels of different coverage enhancement levels).
  • the base station may also configure different or the same backoff time parameter table for physical coverage access channels (or random access responses of different coverage enhancement levels) of different coverage enhancement levels.
  • the random access response window size is represented by the number of random access response repetition windows.
  • the base station After receiving the random access preamble sequence sent by the UE, the base station repeatedly receives the secondary base station corresponding to the random access preamble sequence on the physical random access channel one or more times.
  • the last subframe of the preamble sequence ends + k subframes, and the random access response window in the random access response window with the ra-ResponseWindowSize-MTC random access response repetition window performs multiple repetitions of the random transmission.
  • MAC Medium Access Control
  • PDU Protocol Data Unit
  • K is a constant, which may be a preset value or configured by a base station;
  • a MAC PDU consists of a MAC header and zero or more MAC random access responses and selectable padding fields;
  • the number of transmissions is determined by the number of repeated transmissions configured for the repetition window of the coverage enhancement level.
  • the base station after receiving the random access preamble sequence sent by the UE, the base station repeatedly receives the secondary base station corresponding to the random access preamble sequence one or more times on the physical random access channel.
  • the last subframe of the preamble sequence starts with +k subframes, and the length of the random access response window in the random access response window of the ra-ResponseWindowSize-MTC subframe is a random access response repetition window.
  • MAC Medium Access Control
  • PDU Protocol Data Unit
  • K is a constant, which can be a preset value or configured by the base station; n is an integer value whose size is determined by ra-ResponseWindowSize-MTC, the window length of the random access response repeat window, and the adjacent two The interval between random access response repetition windows is determined; one MAC PDU consists of one MAC header and zero or more MAC random access responses and selectable padding fields; the specific number of repeated transmissions is the coverage The number of repeated transmissions configured by the repeating window of the enhanced level is determined.
  • different random access response window sizes may be assigned for different PRACH coverage enhancement levels.
  • different PRACH coverage enhancement levels may be assigned the same random access response window size.
  • the different PRACH coverage enhancement levels have the same or different backoff time parameter tables.
  • the measurement unit of the parameter value in the back time parameter table is a PRACH repetition window.
  • method 700 ends at step S740.
  • Figure 8 illustrates a flow diagram of a method performed by a user equipment in accordance with one embodiment of the present invention. As shown in FIG. 8, method 800 begins at step S810.
  • the UE reads the configuration information of the size of the random access window and/or the back indication information according to the coverage enhancement level of the random access response of the UE.
  • the UE reads the configuration information of the size of the random access window and/or the back indication information according to the coverage enhancement level of the PRACH of the random access preamble sequence sent by the UE.
  • the slave UE corresponding to the random access preamble sequence repeatedly transmits the last subframe of the preamble sequence one or more times on the physical random access channel.
  • the ra-ResponseWindowSize-MTC random access response window with random access response window of ra-ResponseWindowSize-MTC random access response window is used to monitor the random access response (E) ) PDCCH (M-PDCCH) or PDSCH.
  • K is a constant, which may be a preset value or configured by a base station;
  • a MAC PDU consists of a MAC header and zero or more MAC random access responses and selectable padding fields;
  • the number of transmissions is determined by the number of repeated transmissions configured for the repetition window of the coverage enhancement level.
  • the (E)PDCCH refers to an (E)PDCCH (M-PDCCH) for scheduling a PDSCH carrying a random access response message.
  • the (E)PDCCH may be an EPDCCH defined by an existing LTE system or a newly designed narrowband PDCCH (M-PDCCH).
  • the PDSCH is a PDSCH carrying a random access response message without (E)PDCCH (M-PDCCH) scheduling.
  • E E
  • M-PDCCH random access response message without (E)PDCCH
  • the UE directly monitors the PDSCH carrying the random access response message.
  • the slave UE corresponding to the random access preamble sequence repeats the transmission of the preamble sequence one or more times on the physical random access channel.
  • E PDCCH (M-PDCCH) on which the random access response is monitored on the n random access response repetition windows in the random access response window of the ra-ResponseWindowSize-MTC subframe starting at +k subframes Or PDSCH.
  • K is a constant, which can be a preset value or configured by the base station; n is an integer value whose size is determined by ra-ResponseWindowSize-MTC, the window length of the random access response repeat window, and the adjacent two The interval between random access response repetition windows is determined; one MAC PDU consists of one MAC header and zero or more MAC random access responses and selectable padding fields; the specific number of repeated transmissions is the coverage The number of repeated transmissions configured by the repeating window of the enhanced level is determined.
  • the (E)PDCCH refers to an (E)PDCCH (M-PDCCH) for scheduling a PDSCH carrying a random access response message.
  • the (E)PDCCH may be an EPDCCH defined by an existing LTE system or a newly designed narrowband PDCCH (M-PDCCH).
  • the PDSCH is a PDSCH carrying a random access response message without (E)PDCCH (M-PDCCH) scheduling.
  • E E
  • M-PDCCH random access response message without (E)PDCCH
  • the UE directly monitors the PDSCH carrying the random access response message.
  • the different PRACH coverage enhancement levels have the same or different backoff time parameter tables.
  • the measurement unit of the parameter value in the back time parameter table is a PRACH repetition window.
  • method 800 ends at step S840.
  • the above embodiments of the present invention may be implemented by software, hardware or software and hard. A combination of the two is achieved.
  • various components within the device in the above embodiments may be implemented by various devices including, but not limited to, analog circuit devices, digital circuit devices, digital signal processing (DSP) circuits, programmable processors, dedicated Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs), Programmable Logic Devices (CPLDs), and more.
  • DSP digital signal processing
  • ASICs dedicated Integrated Circuits
  • FPGAs Field Programmable Gate Arrays
  • CPLDs Programmable Logic Devices
  • embodiments of the invention disclosed herein may be implemented on a computer program product.
  • the computer program product is a product having a computer readable medium encoded with computer program logic that, when executed on a computing device, provides related operations to implement The above technical solution of the present invention.
  • the computer program logic When executed on at least one processor of a computing system, the computer program logic causes the processor to perform the operations (methods) described in the embodiments of the present invention.
  • Such an arrangement of the present invention is typically provided as software, code and/or other data structures, or such as one or more, that are arranged or encoded on a computer readable medium such as an optical medium (e.g., CD-ROM), floppy disk, or hard disk.
  • Software or firmware or such a configuration may be installed on the computing device such that one or more processors in the computing device perform the technical solutions described in the embodiments of the present invention.

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Abstract

提供了一种基站，包括：配置单元，用于为不同覆盖增强等级的随机接入响应配置随机接入响应窗大小；以及发送单元，用于在随机接入响应窗内的某一重复窗上发送该随机接入响应的媒体接入控制的协议数据单元。还提供了一种用户设备以及相应的方法。

Description

用于配置随机接入响应窗的方法以及基站和用户设备 技术领域
本发明涉及无线通信技术领域，更具体地，本发明涉及随机接入响应窗的配置方法、基站和用户设备。
背景技术
随着移动通信的快速增长和技术的巨大进步，世界将走向一个完全互联互通的网络社会，即任何人或任何东西在任何时间和任何地方都可以获得信息和共享数据。预计到2020年，互联设备的数量将达到500亿部，其中仅有100亿部左右可能是手机和平板电脑，其它的则不是与人对话的机器，而是彼此对话的机器。因此，如何设计系统以支持数量庞大的机器通信设备是一项需要深入研究的课题。
在第三代合作伙伴计划(3GPP)的长期演进项目(LTE)的标准中，将机器对机器的通信称为机器类型通信(Machine Type Communication，MTC)。MTC是一种不需要人为参与的数据通信服务。大规模的MTC用户设备部署，可以用于安全、跟踪、付账、测量以及消费电子等领域，具体涉及的应用包括视频监控、供货链跟踪、智能电表，远程监控等。MTC要求较低的功率消耗，支持较低的数据传输速率和较低的移动性。目前的LTE系统主要是针对人与人的通信服务。而实现MTC服务的规模竞争优势及应用前景的关键在于LTE网络支持低成本的MTC设备。
另外，一些MTC设备需要安装在居民楼地下室或者由绝缘箔片、金属护窗或者传统建筑物的厚墙保护的位置，相比较LTE网络中常规设备终端(如手机，平板电脑等)，这些设备的空中接口将明显遭受更严重的穿透损失。3GPP决定研究附加20dB覆盖增强的MTC设备的方案设计与性能评估，值得注意的是，位于糟糕网络覆盖区域的MTC设备具有以下特点：非常低的数据传输速率、非常宽松的延时要求以及有限的移动性。针对以上MTC特点，LTE网络可以进一步优化一些信令和/或信道用以更好地支持MTC业务。
为此，在2014年6月举行的3GPP RAN#64次全会上，提出了一个新的面向Rel-13的低复杂性和覆盖增强的MTC的工作项目(参见非专利文献：RP-140990 New Work Item on Even Lower Complexity and Enhanced Coverage LTE UE for MTC，Ericsson，NSN)。在该工作项目的描述中，LTE Rel-13系统需要支持上下行1.4MHz射频带宽的MTC用户设备(User Equipment，UE，以下称为窄带MTC UE)工作在任意的系统带宽(例如1.4MHz、3MHz、5MHz、10MHz、15MHz、20MHz等等)下，并且为该类MTC用户提供覆盖增强功能。在系统设计时，低成本MTC用户和覆盖增强MTC用户要采用统一的设计方案。
在现有的LTE系统中，当eNB检测到UE发送的前导序列时，eNB将在物理下行共享信道(Physical Downlink Shared CHannel，PDSCH)上发送随机接入响应(Random Access Response，RAR)，包含：检测到的前导序列索引、用于上行同步的时间调整信息、初始的上行资源分配(用于发送随后的msg3)以及一个临时的小区无线网络临时标识(Cell-Radio Network Temporary Identifier，C-RNTI)。
UE发送前导序列后，需要在随机接入响应窗内使用随机接入无线网络临时标识(Random Access-Radio Network Temporary Identifier，RA-RNTI)来监听物理下行控制信道(Physical Downlink Control CHannel，PDCCH)以接收RAR消息。
RA-RNTI＝1+t_id+10*f_id
其中，
t_id：发送前导的物理随机接入信道(Physical Random Access Channel，PRACH)的第一个子帧(subframe)索引号(0≤t_id＜10))；
f_id：在这个子帧里PRACH的频域位置索引(0≤f_id＜6)，对于FDD系统而言，只有一个频域位置。因此，f_id永远为零。RA-RNTI与UE发送前导序列的时频位置一一对应。UE和eNB可以分别计算前导序列对应的RA-RNTI值。UE根据计算所得到RA-RNTI值来接收RAR消息。如果RAR中的前导序列索引与UE自己发送的前导序列相同，那么UE就采用RAR中的上行时间调整信息，并启动相应的冲突解决过程。
随机接入响应窗是从UE发送了前导序列的子帧+3个子帧开始，长度为ra-ResponseWindowSize个子帧。ra-ResponseWindowSize的定义可参见表1。如果在此时间内UE没有收到回复给自己的RAR，就认为此次接入失败。在RAR消息中，还可能存在一个backoff指示，指示UE重传前导的等待时间范围。如果某次接入失败，UE需要推迟一段时间，才能进行下一次的前导接入。而推迟的时间范围就由backoffindicator来指示。UE可以在0到backoffindicator之间随机取值。这样可以减少已发生碰撞的UE在相同时间再次发送前导序列的几率。
表1 RACH-ConfigCommon信息元
Figure PCTCN2015089847-appb-000001
Figure PCTCN2015089847-appb-000002
对于覆盖增强的MTC UE而言，需要采用增强技术来提高MTC UE物理信道的接收信号强度。在Rel-12MTC的讨论中，主要采用子帧绑定或重复传输的方式来提高MTC物理信道的接收信号强度。处于不同地理位置的MTC UE所需覆盖增强的程度会不一样，可以将同一小区的MTC UEs划分为多个不同覆盖增强等级，不同覆盖增强等级所需重复传输的次数不一样。也可以用重复等级(repetition level)来表示覆盖增强等级。例如，可以将覆盖增强的MTC UE的PRACH分为4个重复等级(0、1、2、3)，分别对应于覆盖增强0dB、5dB、10dB、15dB。可以将某一重复等级的开始传输的子帧到其结束子帧间的时间间隔称为重复窗(repetition window)。那么，不同重复等级会有不同的重复窗大小。对于某一重复等级的PRACH重复窗，会有与其对应重复等级的RAR传输。
与现有的LTE系统相比，支持覆盖增强MTC的Rel-13LTE系统，其覆盖增强MTC UE物理信道传输的时间粒度不同，现有的系统是以子帧作为一次传输的时间计量，而覆盖增强MTC的物理信道传输的时间粒度为重复窗。因此，针对覆盖增强MTC而言，需要重新考虑覆盖增强MTC UE的随机接入响应窗的设计。
发明内容
根据本发明的一个方面，提供了一种基站，包括：配置单元，用于为不同覆盖增强等级的随机接入响应配置随机接入响应窗大小；以及发送单元，用于在随机接入响应窗内的某一重复窗上发送该随机接入响应的媒体接入控制的协议数据单元。
优选地，随机接入响应窗大小是以随机接入响应重复窗的个数来表 示的。
优选地，配置单元为不同的随机接入响应的覆盖增强等级配置不同的随机接入响应窗大小。
优选地，配置单元为不同的随机接入响应的覆盖增强等级配置相同的随机接入响应窗大小。
优选地，不同的物理随机接入信道PRACH的覆盖增强等级具有相同或不同的后退时间参数表。
优选地，后退时间参数表中的数值的计量单位为PRACH重复窗。
根据本发明的另一个方面，提供了一种用户设备，包括：接收单元，监测随机接入响应窗内的一个或多个重复窗上的随机接入响应的增强物理下行控制信道EPDCCH(等同于M-PDCCH)或物理下行共享信道PDSCH；以及提取单元，用于读取随机接入响应窗大小，其中，随机接入窗大小与随机接入响应的覆盖增强等级相对应。
优选地，随机接入响应窗大小是以随机接入响应重复窗的个数来表示的。
优选地，不同的随机接入响应的覆盖增强等级具有不同的随机接入响应窗大小。
优选地，不同的随机接入响应的覆盖增强等级具有相同的随机接入响应窗大小。
优选地，不同的随机接入响应的覆盖增强等级具有相同或不同的后退时间参数表。
优选地，后退时间参数表中的数值的计量单位为物理随机接入信道PRACH重复窗。
根据本发明的另一个方面，提供了一种由基站执行的方法，包括：为不同覆盖增强等级的随机接入响应配置随机接入响应窗大小；以及在随机接入响应窗内的某一重复窗上发送该随机接入响应的媒体接入控制的协议数据单元。
优选地，随机接入响应窗大小是以随机接入响应重复窗的个数来表示的。
优选地，为不同的物理随机接入信道PRACH覆盖增强等级分配不同的随机接入响应窗大小。
优选地，为不同的物理随机接入信道PRACH覆盖增强等级分配相同的随机接入响应窗大小。
优选地，不同的物理随机接入信道PRACH覆盖增强等级具有相同或不同的后退时间参数表。
优选地，后退时间参数表中的数值的计量单位为PRACH重复窗。
根据本发明的另一个方面，提供了一种由用户设备执行的方法，包括：监测随机接入响应窗内的一个或多个重复窗上的随机接入响应的增强物理下行控制信道EPDCCH(M-PDCCH)或物理下行共享信道PDSCH；以及读取随机接入响应窗大小，其中，随机接入窗大小与随机接入响应的覆盖增强等级相对应。
优选地，随机接入响应窗大小是以随机接入响应重复窗的个数来表示的。
优选地，不同的随机接入响应的覆盖增强等级具有不同的随机接入响应窗大小。
优选地，不同的随机接入响应的覆盖增强等级具有相同的随机接入响应窗大小。
优选地，不同的物理随机接入信道PRACH覆盖增强等级具有相同或不同的后退时间参数表。
优选地，后退时间参数表中的数值的计量单位为PRACH重复窗。
附图说明
通过下文结合附图的详细描述，本发明的上述和其它特征将会变得更加明显，其中：
图1示出了根据本发明一个实施例的基站的框图。
图2示出了根据本发明一个实施例的用户设备的框图。
图3示出了根据本发明一个实施例的基于重复窗的不同覆盖增强等级配置不同随机接入响应窗大小的示意图。
图4示出了根据本发明一个实施例的基于子帧的不同覆盖增强等级配置不同随机接入响应窗大小的示意图。
图5示出了根据本发明一个实施例的基于重复窗的不同覆盖增强等级配置相同随机接入响应窗大小的示意图。
图6示出了根据本发明一个实施例的基于子帧的不同覆盖增强等级配置相同随机接入响应窗大小的示意图。
图7示出了根据本发明一个实施例的由基站执行的方法的流程图。
图8示出了根据本发明一个实施例的由用户设备执行的方法的流程图。
具体实施方式
下面结合附图和具体实施方式对本发明进行详细阐述。应当注意，本发明不应局限于下文所述的具体实施方式。另外，为了简便起见，省略了对与本发明没有直接关联的公知技术的详细描述，以防止对本发明的理解造成混淆。
下文以LTE移动通信系统及其后续的演进版本作为示例应用环境，具体描述了根据本发明的实施方式。然而，需要指出的是，本发明不限于以下实施方式，而是可适用于更多其它的无线通信系统，例如今后的5G蜂窝通信系统。
图1示出了根据本发明一个实施例的基站100的框图。如图1所示，基站100包括配置单元110和发送单元120。本领域技术人员应理解，基站100还可以包括实现其功能所必需的其他功能单元，如各种处理器、存储器等。然而为了简便，省略了这些公知元件的详细描述。
配置单元110可以为不同覆盖增强等级的随机接入响应配置随机接入响应窗大小。配置单元110还可以为不同覆盖增强等级的随机接入响应配置后退指示信息(Backoff Indicator)。进一步地，配置单元110可以配置其它的配置信息。
在现有的LTE系统中，随机接入响应窗指从UE发送了前导序列的子帧+3个子帧开始，长度为ra-ResponseWindowSize个子帧的一段时间长度。UE发送前导序列后，需要在所述的随机接入响应窗内监听物理下行控制信道(Physical Downlink Control CHannel，PDCCH)以接收RAR消息。
对覆盖增强MTC UE而言，其上、下行物理信道需要多次重复发送，以满足信道的覆盖增强要求。处于不同地理位置的UE所需的信道覆盖增强程度不一样，也可以说处于不同地理位置的UE的物理信道所需重复发送的次数不同。因此，可以将物理信道的覆盖增强程度分为若干个 不同的覆盖增强等级。而不同覆盖增强等级的物理信道，其所需重复发送的次数不同。例如，可以等级物理随机接入信道PRACH分为四个覆盖增强等级(CE0、CE1、CE2和CE3)，每一PRACH覆盖增强等级对应于一固定窗长的PRACH重复窗。不同覆盖增强等级的物理信道，其重复窗的窗长不一样。每一覆盖增强等级的PRACH有一个与其对应的覆盖增强等级的随机接入响应。每一个覆盖增强等级的随机接入响应对应于一固定窗长的承载随机接入响应的物理下行共享信道PDSCH的重复窗，或简称随机接入响应重复窗。备选地，每一个覆盖增强等级的随机接入响应对应于一固定窗长的用于调度承载随机接入响应的物理下行共享信道PDSCH的(E)PDCCH(M-PDCCH)重复窗，或简称随机接入响应重复窗。备选地，每一个覆盖增强等级的随机接入响应对应于一固定窗长的用于调度承载随机接入响应的物理下行共享信道PDSCH的(E)PDCCH(M-PDCCH)重复窗以及该M-PDCCH调度的PDSCH重复窗，或简称随机接入响应重复窗。
重复窗指完成某一覆盖增强等级的数据和/或信令传输的第一次发送至最后一次重复发送之间的时间间隔。
随机接入响应重复窗指完成某一覆盖增强等级的随机接入响应RAR传输的第一次发送至最后一次重复发送之间的时间间隔。其中，随机接入响应RAR传输包括用于调度承载随机接入响应的物理下行共享信道PDSCH的(E)PDCCH(M-PDCCH)以及该M-PDCCH调度的PDSCH。
物理信道的重复窗可以用该物理信道的第一次发送的无线帧号+子帧号和最后一次发送的无线帧号+子帧号来表示；
备选地，物理信道的重复窗可以用该物理信道的第一次发送的无线帧号+子帧号和该物理信道所需的重复发送次数来表示；
备选地，物理信道的重复窗可以用该物理信道的第一次发送的无线帧号+子帧号、该物理信道所需的重复发送次数以及该物理信道的可用子帧指示来表示。物理信道的可用子帧指示可以用位映射(bitmapping)的方式实现，即对应于某一子帧的bit，如果该bit为1，表示该子帧可用于该物理信道的传输；如果该bit为0，表示该子帧不能用于该物理信道的传输。
覆盖增强MTC UE的随机接入响应窗可以用承载随机接入响应消息的物理下行共享信道(Physical Downlink Shared CHannel，PDSCH)的重复窗的个数或子帧的个数来表示。备选地，覆盖增强MTC UE的随机接入响应窗可以用调度承载随机接入响应消息的物理下行共享信道(Physical Downlink Shared CHannel，PDSCH)的(E)PDCCH(M-PDCCH)重复窗的个数或子帧的个数来表示。
下表2为用重复窗的个数表示随机接入响应窗的大小。此时的随机接入响应窗可以描述为从UE在物理随机接入信道上多次重复发送前导序列结束的最后子帧+k个子帧开始，长度为ra-ResponseWindowSize-MTC个重复窗。其中，K为常数，可以为某一预先设置的值或由基站进行配置。
下表3为用子帧的个数表示随机接入响应窗的大小。与现有的LTE系统不同，其子帧的数值需要增大。此时的随机接入响应窗可以描述为从UE在物理随机接入信道上多次重复发送前导序列结束的最后子帧+k个子帧开始，长度为ra-ResponseWindowSize-MTC个子帧。其中。K为常数，可以为某一预先设置的值或由基站进行配置。
基站可以为不同覆盖增强等级的随机接入响应(或不同覆盖增强等级的物理随机接入信道)配置不同或相同的随机接入响应窗大小。基站还可以为不同覆盖增强等级的物理随机接入信道(或不同覆盖增强等级的随机接入响应)配置不同或相同的后退时间参数表。
表2 RACH-ConfigCommon信息元
Figure PCTCN2015089847-appb-000003
Figure PCTCN2015089847-appb-000004
表3 RACH-ConfigCommon信息元
Figure PCTCN2015089847-appb-000005
Figure PCTCN2015089847-appb-000006
发送单元120在接收到UE发来的随机接入前导序列后，将在该随机接入前导序列所对应的从基站在物理随机接入信道上一次或多次重复接收该前导序列结束的最后子帧+k个子帧开始，拥有ra-ResponseWindowSize-MTC个随机接入响应重复窗的随机接入响应窗内的某一随机接入响应重复窗上进行多次重复发送该随机接入响应的媒体接入控制(Medium Access Control，MAC)的协议数据单元(Protocol Data Unit，PDU)MAC PDU。其中，K为常数，可以为某一预先设置的值或由基站进行配置；一个MAC PDU由一个MAC头和零个或多个MAC随机接入响应和可选择的填充字段所组成；具体的重复发送次数由为该覆盖增强等级的重复窗所配置的重复发送次数所确定。
备选地，发送单元120在接收到UE发来的随机接入前导序列后，将在该随机接入前导序列所对应的从基站在物理随机接入信道上一次或 多次重复接收该前导序列结束的最后子帧+k个子帧开始，长度为ra-ResponseWindowSize-MTC个子帧的随机接入响应窗内的n个随机接入响应重复窗中的某一随机接入响应重复窗上进行多次重复发送该随机接入响应的媒体接入控制(Medium Access Control，MAC)的协议数据单元(Protocol Data Unit，PDU)MAC PDU。其中，K为常数，可以为某一预先设置的值或由基站进行配置；n为某一整数值，其大小由ra-ResponseWindowSize-MTC、随机接入响应重复窗的窗长和相邻的两个随机接入响应重复窗之间的间隔所决定；一个MAC PDU由一个MAC头和零个或多个MAC随机接入响应和可选择的填充字段所组成；具体的重复发送次数由为该覆盖增强等级的重复窗所配置的重复发送次数所确定。
图2示出了根据本发明一个实施例的UE 200的框图。如图2所示，UE 200包括接收单元210和提取单元220。本领域技术人员应理解，UE200还可以包括实现其功能所必需的其他功能单元，如各种处理器、存储器等。然而为了简便，省略了这些公知元件的详细描述。
在接收单元210中，优选地，UE发送完随机接入前导序列后，将在该随机接入前导序列所对应的从UE在物理随机接入信道上一次或多次重复发送前导序列结束的最后子帧+k个子帧开始，拥有ra-ResponseWindowSize-MTC个随机接入响应重复窗的随机接入响应窗内的ra-ResponseWindowSize-MTC个随机接入响应重复窗上监测其随机接入响应的(E)PDCCH(M-PDCCH)或PDSCH。其中，K为常数，可以为某一预先设置的值或由基站进行配置；一个MAC PDU由一个MAC头和零个或多个MAC随机接入响应和可选择的填充字段所组成；具体的重复发送次数由为该覆盖增强等级的重复窗所配置的重复发送次数所确定。
所述(E)PDCCH(M-PDCCH)指用于调度承载随机接入响应消息的PDSCH的(E)PDCCH(M-PDCCH)。该(E)PDCCH可以是现有LTE系统定义的EPDCCH或新设计的窄带PDCCH(M-PDCCH)。
所述PDSCH为没有(E)PDCCH(M-PDCCH)调度的承载随机接入响应消息的PDSCH。此时，由于没有(E)PDCCH(M-PDCCH)的调度，UE直接监测承载随机接入响应消息的PDSCH。
在接收单元210中，备选地，UE发送完随机接入前导序列后，将在该随机接入前导序列所对应的从UE在物理随机接入信道上一次或多次重复发送前导序列结束的最后子帧+k个子帧开始，长度为ra-ResponseWindowSize-MTC个子帧的随机接入响应窗内的n个随机接入响应重复窗上监测其随机接入响应的(E)PDCCH(M-PDCCH)或PDSCH。其中，K为常数，可以为某一预先设置的值或由基站进行配置；n为某一整数值，其大小由ra-ResponseWindowSize-MTC、随机接入响应重复窗的窗长和相邻的两个随机接入响应重复窗之间的间隔所决定；一个MAC PDU由一个MAC头和零个或多个MAC随机接入响应和可选择的填充字段所组成；具体的重复发送次数由为该覆盖增强等级的重复窗所配置的重复发送次数所确定。
所述(E)PDCCH(M-PDCCH)指用于调度承载随机接入响应消息的PDSCH的(E)PDCCH(M-PDCCH)。该(E)PDCCH(M-PDCCH)可以是现有LTE系统定义的EPDCCH或新设计的窄带PDCCH(M-PDCCH)。
所述PDSCH为没有(E)PDCCH(M-PDCCH)调度的承载随机接入响应消息的PDSCH。此时，由于没有(E)PDCCH(M-PDCCH)的调度，UE直接监测承载随机接入响应消息的PDSCH。
在提取单元220中，UE根据该UE的随机接入响应的覆盖增强等级来读取其随机接入响应窗的大小和/或后退指示信息的配置信息。或者，UE根据该UE发送随机接入前导序列的PRACH的覆盖增强等级来读取其随机接入窗的大小和后退指示信息的配置信息。
下面，结合附图3-6来详细描述根据本发明一个实施例的基于重复窗(子帧)的不同覆盖增强等级来配置不同随机接入响应窗大小的示例。
图3示出了根据本发明一个实施例的基于重复窗的不同覆盖增强等级配置不同随机接入响应窗大小的示意图。在本实施例中，PRACH分为四个覆盖增强等级(CE0、CE1、CE2和CE3)，每一覆盖增强等级对应于一固定窗长的PRACH重复窗。每一覆盖增强等级的PRACH有一个与其对应的覆盖增强等级的随机接入响应。每一个覆盖增强等级的随机接入响应对应于一固定窗长的随机接入响应的重复窗。
基站100可以为不同覆盖增强等级的随机接入响应(或不同覆盖增 强等级的物理随机接入信道)配置不同的随机接入响应窗大小。在图3所示的示例中，随机接入响应窗大小是指随机接入响应重复窗的个数。例如，基站100为随机接入响应覆盖增强等级CE0配置的随机接入响应窗大小为10(即10个该覆盖增强等级的随机接入响应重复窗)。相应地，CE1为5(即5个该覆盖增强等级的随机接入响应重复窗)，CE2为3(即3个该覆盖增强等级的随机接入响应重复窗)，CE3为2(即2个该覆盖增强等级的随机接入响应重复窗)。
随机接入响应窗大小的配置信息可以通过预先设置的方式，或通过MIB或SIBx或MAC PDU或专用RRC信令通知给MTC UE。其中，MIB是主信息块(Master Information Block，MIB)，SIB是系统信息块(System Information Block，SIB)，SIBx是SIB1和/或SIB2和/或其它的SIB。
图4示出了根据本发明一个实施例的基于子帧的不同覆盖增强等级配置不同随机接入响应窗大小的示意图。如图4所示，在本实施例中，PRACH分为四个覆盖增强等级(CE0、CE1、CE2和CE3)，每一覆盖增强等级对应于一固定窗长的PRACH重复窗。每一覆盖增强等级的PRACH有一个与其对应的覆盖增强等级的随机接入响应。每一覆盖增强等级的随机接入响应对应于一固定窗长的随机接入响应重复窗。
基站100可以为为不同覆盖增强等级的随机接入响应(或不同覆盖增强等级的物理随机接入信道)配置不同的随机接入响应窗大小。在图4所示的示例中，随机接入响应窗大小是指下行子帧的个数。例如，基站100为随机接入响应覆盖增强等级CE0配置的随机接入响应窗大小为250(即250个下行子帧)。相应地，CE1为200(即200个下行子帧)，CE2为150(即150个下行子帧)，CE3为100(即100个下行子帧)。
随机接入响应窗大小的配置信息可以通过预先设置的方式，或通过MIB或SIBx或MAC PDU或专用RRC信令通知给MTC UE。其中，MIB是主信息块(Master Information Block，MIB)，SIB是系统信息块(System Information Block，SIB)，SIBx是SIB1和/或SIB2和/或其它的SIB。
图5示出了根据本发明一个实施例的基于重复窗的不同覆盖增强等级配置相同随机接入响应窗大小的示意图。如图5所示，在本实施例中，PRACH分为四个覆盖增强等级(CE0、CE1、CE2和CE3)，每一覆盖增强等级对应于一固定窗长的PRACH重复窗。每一覆盖增强等级的 PRACH有一个与其对应的覆盖增强等级的随机接入响应。每一覆盖增强等级的随机接入响应对应于一固定窗长的随机接入响应重复窗。
基站100可以为不同覆盖增强等级的随机接入响应(或不同覆盖增强等级的物理随机接入信道)配置相同的随机接入响应窗大小。在图5所示的示例中，随机接入响应窗大小是指随机接入响应重复窗的个数。例如，基站100为随机接入响应覆盖增强等级CE0/CE1/CE2/CE3配置的随机接入响应窗大小都为5(即5个对应的覆盖增强等级的随机接入响应重复窗)。
随机接入响应窗大小的配置信息可以通过预先设置的方式，或通过MIB或SIBx或MAC PDU或专用RRC信令通知给MTC UE。其中，MIB是主信息块(Master Information Block，MIB)，SIB是系统信息块(System Information Block，SIB)，SIBx是SIB1和/或SIB2和/或其它的SIB。
图6示出了根据本发明一个实施例的基于子帧的不同覆盖增强等级配置相同随机接入响应窗大小的示意图。如图6所示，在本实施例中，PRACH分为四个覆盖增强等级(CE0、CE1、CE2和CE3)，每一覆盖增强等级对应于一固定窗长的PRACH重复窗。每一覆盖增强等级的PRACH有一个与其对应的覆盖增强等级的随机接入响应。每一覆盖增强等级的随机接入响应对应于一固定窗长随机接入响应重复窗。
基站100可以为不同覆盖增强等级的随机接入响应(或不同覆盖增强等级的物理随机接入信道)配置相同的随机接入响应窗大小。在图6所示的示例中，随机接入响应窗大小是指下行子帧的个数。例如，基站100为随机接入响应覆盖增强等级CE0/CE1/CE2/CE3配置的随机接入响应窗大小都为200(即200个下行子帧)。
随机接入响应窗大小的配置信息可以通过预先设置的方式，或通过MIB或SIBx或MAC PDU或专用RRC信令通知给MTC UE。其中，MIB是主信息块(Master Information Block，MIB)，SIB是系统信息块(System Information Block，SIB)，SIBx是SIB1和/或SIB2和/或其它的SIB。
在现有的LTE系统中，UE发送随机接入前导序列后，在随机接入响应窗内监测PDCCH。若检测到随机接入响应(使用RA-RNTI检测到对应的PDCCH)，但在相应的MAC PDU中未检测到该UE自己发送的随机接入前导序列的标识符而是检测到BackoffIndicator，说明前导序列 已被eNode B检测到，但有多个前导序列采用了相同的时频资源发送随机接入请求(即各UE具有相同的RA-RNTI)，UE将后退时间(backoff time)设置为后退指示字段(backoff indicator)所规定的值，并向上层指示随机接入尝试失败。若上层收到随机接入尝试失败通知，并且重传次数未达到规定的重传上限，则UE在0至后退时间段内随机选择一个延迟时间，重新发送随机接入前导序列。例如，后退参数值的设置是以毫秒(子帧)为计量单位，如下表4所示。
表4
索引 后退参数值(ms)
0 0
1 10
2 20
3 30
4 40
5 60
6 80
7 120
8 160
9 240
10 320
11 480
12 960
13 保留
14 保留
15 保留
对覆盖增强MTC UE而言，PRACH需要进行多次重复发送，以达到其覆盖增强等级的要求。不同覆盖增强等级的PRACH，其所需重复发送的次数不同，即PRACH重复窗的窗长不一样。例如，如图3所示，四个PRACH覆盖增强等级有四个不同的重复窗窗长。覆盖增强MTC UE可以采用与现有LTE系统类似的后退机制。具体实施方式如下：
实施方式一，如表4所示，后退时间参数表中的参数值的计量单位为毫秒(ms)。
不同PRACH覆盖增强等级的MTC UE采用同一个后退时间参数表。但不同PRACH覆盖增强等级的MTC UE可以配置相同或不同的后退时间。后退时间参数表可以是现有LTE系统的参数表(如表4)，也可以是重新设计后的参数表。
备选地，不同PRACH覆盖增强等级的MTC UE采用不同的后退时间参数表。例如，PRACH覆盖增强等级CE0采用现有的表格(表1)，其它覆盖增强等级的后退时间参数表重新设计。
备选地，将所有的PRACH覆盖增强等级分成若干组，不同组的MTC UE采用不同的后退时间参数表。例如，将四个PRACH覆盖增强等级分成两组，CE0和CE1为组1，CE2和CE3为组2。组1与组2采用不同的后退时间参数表。
实施方式二，如表5所示，后退时间参数表中的参数值的计量单位为PRACH重复窗。
不同PRACH覆盖增强等级的MTC UE采用同一个后退时间参数表。但不同PRACH覆盖增强等级的MTC UE可以配置相同或不同的后退时间。
备选地，不同PRACH覆盖增强等级的MTC UE采用不同的后退时间参数表。例如，PRACH覆盖增强等级CE0的后退时间参数表采用表5，其它覆盖增强等级的后退时间参数表重新设计。
备选地，将所有的PRACH覆盖增强等级分成若干组，不同组的MTC UE采用不同的后退时间参数表。例如，将四个PRACH覆盖增强等级分成两组，CE0和CE1为组1，CE2和CE3为组2。组1与组2采用不同的后退时间参数表。
表5
索引 后退参数值(rw)
0 0
1 10
2 20
3 30
4 40
5 60
6 80
7 120
8 160
9 240
10 320
11 480
12 960
13 保留
14 保留
15 保留
注：rw表示PRACH重复窗的个数
图7示出了根据本发明一个实施例的由基站执行的方法的流程图。如图7所示，方法700在步骤S710处开始。
在步骤S720处，基站为不同覆盖增强等级的随机接入响应(或不同覆盖增强等级的物理随机接入信道)配置不同或相同的随机接入响应窗大小。基站还可以为不同覆盖增强等级的物理随机接入信道(或不同覆盖增强等级的随机接入响应)配置不同或相同的后退时间参数表。优选地，随机接入响应窗大小是以随机接入响应重复窗的个数来表示的。
在步骤S730处，优选地，基站在接收到UE发来的随机接入前导序列后，将在该随机接入前导序列所对应的从基站在物理随机接入信道上一次或多次重复接收该前导序列结束的最后子帧+k个子帧开始，拥有ra-ResponseWindowSize-MTC个随机接入响应重复窗的随机接入响应窗内的某一随机接入响应重复窗上进行多次重复发送该随机接入响应的媒体接入控制(Medium Access Control，MAC)的协议数据单元(Protocol Data Unit，PDU)MAC PDU。其中，K为常数，可以为某一预先设置的值或由基站进行配置；一个MAC PDU由一个MAC头和零个或多个MAC随机接入响应和可选择的填充字段所组成；具体的重复发送次数由为该覆盖增强等级的重复窗所配置的重复发送次数所确定。
在步骤S730处，备选地，基站在接收到UE发来的随机接入前导序列后，将在该随机接入前导序列所对应的从基站在物理随机接入信道上一次或多次重复接收该前导序列结束的最后子帧+k个子帧开始，长度为ra-ResponseWindowSize-MTC个子帧的随机接入响应窗内的n个随机接入响应重复窗中的某一随机接入响应重复窗上进行多次重复发送该随机 接入响应的媒体接入控制(Medium Access Control，MAC)的协议数据单元(Protocol Data Unit，PDU)MAC PDU。其中，K为常数，可以为某一预先设置的值或由基站进行配置；n为某一整数值，其大小由ra-ResponseWindowSize-MTC、随机接入响应重复窗的窗长和相邻的两个随机接入响应重复窗之间的间隔所决定；一个MAC PDU由一个MAC头和零个或多个MAC随机接入响应和可选择的填充字段所组成；具体的重复发送次数由为该覆盖增强等级的重复窗所配置的重复发送次数所确定。
优选地，可以为不同的PRACH覆盖增强等级分配不同的随机接入响应窗大小。备选地，可以为不同的PRACH覆盖增强等级分配相同的随机接入响应窗大小。
优选地，不同的PRACH覆盖增强等级具有相同或不同的后退时间参数表。其中，后退时间参数表中的参数值的计量单位为PRACH重复窗。
最后，方法700在步骤S740处结束。
图8示出了根据本发明一个实施例的由用户设备执行的方法的流程图。如图8所示，方法800在步骤S810处开始。
在步骤S820处，UE根据该UE的随机接入响应的覆盖增强等级来读取其随机接入窗的大小和/或退指示信息的配置信息。或者，UE根据该UE发送随机接入前导序列的PRACH的覆盖增强等级来读取其随机接入窗的大小和/或后退指示信息的配置信息。
在步骤S830处，优选地，UE发送完随机接入前导序列后，将在该随机接入前导序列所对应的从UE在物理随机接入信道上一次或多次重复发送前导序列结束的最后子帧+k个子帧开始，拥有ra-ResponseWindowSize-MTC个随机接入响应重复窗的随机接入响应窗内的ra-ResponseWindowSize-MTC个随机接入响应重复窗上监测其随机接入响应的(E)PDCCH(M-PDCCH)或PDSCH。其中，K为常数，可以为某一预先设置的值或由基站进行配置；一个MAC PDU由一个MAC头和零个或多个MAC随机接入响应和可选择的填充字段所组成；具体的重复发送次数由为该覆盖增强等级的重复窗所配置的重复发送次数所确定。
所述(E)PDCCH(M-PDCCH)指用于调度承载随机接入响应消息的PDSCH的(E)PDCCH(M-PDCCH)。该(E)PDCCH(M-PDCCH)可以是现有LTE系统定义的EPDCCH或新设计的窄带PDCCH(M-PDCCH)。
所述PDSCH为没有(E)PDCCH(M-PDCCH)调度的承载随机接入响应消息的PDSCH。此时，由于没有(E)PDCCH(M-PDCCH)的调度，UE直接监测承载随机接入响应消息的PDSCH。
在步骤S830处，备选地，UE发送完随机接入前导序列后，将在该随机接入前导序列所对应的从UE在物理随机接入信道上一次或多次重复发送前导序列结束的最后子帧+k个子帧开始，长度为ra-ResponseWindowSize-MTC个子帧的随机接入响应窗内的n个随机接入响应重复窗上监测其随机接入响应的(E)PDCCH(M-PDCCH)或PDSCH。其中，K为常数，可以为某一预先设置的值或由基站进行配置；n为某一整数值，其大小由ra-ResponseWindowSize-MTC、随机接入响应重复窗的窗长和相邻的两个随机接入响应重复窗之间的间隔所决定；一个MAC PDU由一个MAC头和零个或多个MAC随机接入响应和可选择的填充字段所组成；具体的重复发送次数由为该覆盖增强等级的重复窗所配置的重复发送次数所确定。
所述(E)PDCCH(M-PDCCH)指用于调度承载随机接入响应消息的PDSCH的(E)PDCCH(M-PDCCH)。该(E)PDCCH(M-PDCCH)可以是现有LTE系统定义的EPDCCH或新设计的窄带PDCCH(M-PDCCH)。
所述PDSCH为没有(E)PDCCH(M-PDCCH)调度的承载随机接入响应消息的PDSCH。此时，由于没有(E)PDCCH(M-PDCCH)的调度，UE直接监测承载随机接入响应消息的PDSCH。
优选地，不同的PRACH覆盖增强等级具有相同或不同的后退时间参数表。其中，后退时间参数表中的参数值的计量单位为PRACH重复窗。
最后，方法800在步骤S840处结束。
应该理解，本发明的上述实施例可以通过软件、硬件或者软件和硬 件两者的结合来实现。例如，上述实施例中的设备内部的各种组件可以通过多种器件来实现，这些器件包括但不限于：模拟电路器件、数字电路器件、数字信号处理(DSP)电路、可编程处理器、专用集成电路(ASIC)、现场可编程门阵列(FPGA)、可编程逻辑器件(CPLD)，等等。
此外，这里所公开的本发明的实施例可以在计算机程序产品上实现。更具体地，该计算机程序产品是如下的一种产品：具有计算机可读介质，计算机可读介质上编码有计算机程序逻辑，当在计算设备上执行时，该计算机程序逻辑提供相关的操作以实现本发明的上述技术方案。当在计算系统的至少一个处理器上执行时，计算机程序逻辑使得处理器执行本发明实施例所述的操作(方法)。本发明的这种设置典型地提供为设置或编码在例如光介质(例如CD-ROM)、软盘或硬盘等的计算机可读介质上的软件、代码和/或其他数据结构、或者诸如一个或多个ROM或RAM或PROM芯片上的固件或微代码的其他介质、或一个或多个模块中的可下载的软件图像、共享数据库等。软件或固件或这种配置可安装在计算设备上，以使得计算设备中的一个或多个处理器执行本发明实施例所描述的技术方案。
尽管以上已经结合本发明的优选实施例示出了本发明，但是本领域的技术人员将会理解，在不脱离本发明的精神和范围的情况下，可以对本发明进行各种修改、替换和改变。因此，本发明不应由上述实施例来限定，而应由所附权利要求及其等价物来限定。

Claims (24)

  1. 一种基站，包括：
    配置单元，用于为不同覆盖增强等级的随机接入响应配置随机接入响应窗大小；以及
    发送单元，用于在随机接入响应窗内的某一重复窗上发送该随机接入响应的媒体接入控制的协议数据单元。
  2. 根据权利要求1所述的基站，其中，随机接入响应窗大小是以随机接入响应重复窗的个数来表示的。
  3. 根据权利要求1所述的基站，其中，所述配置单元为不同的随机接入响应的覆盖增强等级配置不同的随机接入响应窗大小。
  4. 根据权利要求1所述的基站，其中，所述配置单元为不同的随机接入响应的覆盖增强等级配置相同的随机接入响应窗大小。
  5. 根据权利要求1所述的基站，其中，不同的物理随机接入信道PRACH的覆盖增强等级具有相同或不同的后退时间参数表。
  6. 根据权利要求5所述的基站，其中，后退时间参数表中的数值的计量单位为PRACH重复窗。
  7. 一种用户设备，包括：
    接收单元，监测随机接入响应窗内的一个或多个重复窗上的随机接入响应的物理下行控制信道M-PDCCH或物理下行共享信道PDSCH；以及
    提取单元，用于读取随机接入响应窗大小，其中，随机接入窗大小与随机接入响应的覆盖增强等级相对应。
  8. 根据权利要求7所述的用户设备，其中，随机接入响应窗大小是以随机接入响应重复窗的个数来表示的。
  9. 根据权利要求7所述的用户设备，其中，不同的随机接入响应的覆盖增强等级具有不同的随机接入响应窗大小。
  10. 根据权利要求7所述的用户设备，其中，不同的随机接入响应的覆盖增强等级具有相同的随机接入响应窗大小。
  11. 根据权利要求7所述的用户设备，其中，不同的随机接入响应的覆盖增强等级具有相同或不同的后退时间参数表。
  12. 根据权利要求11所述的用户设备，其中，后退时间参数表中的数值的计量单位为物理随机接入信道PRACH重复窗。
  13. 一种由基站执行的方法，包括：
    为不同覆盖增强等级的随机接入响应配置随机接入响应窗大小；以及
    在随机接入响应窗内的某一重复窗上发送该随机接入响应的媒体接入控制的协议数据单元。
  14. 根据权利要求13所述的方法，其中，随机接入响应窗大小是以随机接入响应重复窗的个数来表示的。
  15. 根据权利要求13所述的方法，其中，为不同的物理随机接入信道PRACH覆盖增强等级分配不同的随机接入响应窗大小。
  16. 根据权利要求13所述的方法，其中，为不同的物理随机接入信道PRACH覆盖增强等级分配相同的随机接入响应窗大小。
  17. 根据权利要求13所述的方法，其中，不同的物理随机接入信道PRACH覆盖增强等级具有相同或不同的后退时间参数表。
  18. 根据权利要求17所述的方法，其中，后退时间参数表中的数值的计量单位为PRACH重复窗。
  19. 一种由用户设备执行的方法，包括：
    监测随机接入响应窗内的一个或多个重复窗上的随机接入响应的物理下行控制信道M-PDCCH或物理下行共享信道PDSCH；以及
    读取随机接入响应窗大小，其中，随机接入窗大小与随机接入响应的覆盖增强等级相对应。
  20. 根据权利要求19所述的方法，其中，随机接入响应窗大小是以随机接入响应重复窗的个数来表示的。
  21. 根据权利要求19所述的方法，其中，不同的随机接入响应的覆盖增强等级具有不同的随机接入响应窗大小。
  22. 根据权利要求19所述的方法，其中，不同的随机接入响应的覆盖增强等级具有相同的随机接入响应窗大小。
  23. 根据权利要求19所述的方法，其中，不同的物理随机接入信道PRACH覆盖增强等级具有相同或不同的后退时间参数表。
  24. 根据权利要求23所述的方法，其中，后退时间参数表中的数值的计量单位为PRACH重复窗。
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