WO2008025233A1 - Système td-scdma et procédé permettant de surveiller l'accès aléatoire à un hsupa - Google Patents

Système td-scdma et procédé permettant de surveiller l'accès aléatoire à un hsupa Download PDF

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Publication number
WO2008025233A1
WO2008025233A1 PCT/CN2007/002463 CN2007002463W WO2008025233A1 WO 2008025233 A1 WO2008025233 A1 WO 2008025233A1 CN 2007002463 W CN2007002463 W CN 2007002463W WO 2008025233 A1 WO2008025233 A1 WO 2008025233A1
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WIPO (PCT)
Prior art keywords
random access
timer
node
user terminal
uplink
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PCT/CN2007/002463
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English (en)
French (fr)
Inventor
Hui Chen
Yincheng Zhang
Zhifeng Ma
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ZTE Corp
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ZTE Corp
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Priority to US12/438,011 priority Critical patent/US8817708B2/en
Priority to EP20070785359 priority patent/EP2061265B1/en
Priority to JP2009521096A priority patent/JP4792525B2/ja
Priority to KR20097005856A priority patent/KR101091015B1/ko
Priority to CN2007800289185A priority patent/CN101502162B/zh
Publication of WO2008025233A1 publication Critical patent/WO2008025233A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H04W72/1273—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of downlink data flows
    • 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
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0866—Non-scheduled access, e.g. ALOHA using a dedicated channel for access

Definitions

  • the present invention relates to the field of wireless communications, and in particular, to a time division synchronous code division multiple access system and a control method thereof for enhancing uplink random access.
  • TD-SCDMA Time Division Synchronous Code Division Multiple Access
  • HSUPA High Speed Uplink Packet Access
  • the 3GPP TD-SCDMA uplink enhancement technology has not yet formed a complete technical report, but the basic technical framework has already appeared. Reference can be made to the proposal and conference report of the 3GPP May Shanghai Conference. The technical framework related to the present invention is described below.
  • E-DCH Enhanced Uplink Dedicated Transport Channel
  • TTI transmission time interval
  • the physical channels that match the E-DCH are:
  • E-AGCH channel (E-DCH absolute grant channel), which is a control channel for Node B (Node B) transmission grant information
  • E-PUCH E-DCH uplink physical channel, also known as enhanced uplink physical channel
  • E-DCH uplink physical channel is a service a channel, which is used by a UE (User Equipment) to carry an E-DCH type coded combined transmission channel, and information related to the auxiliary scheduling is also transmitted on the channel;
  • the E-RUCCH (E-DCH random access uplink control channel, that is, the strong uplink random access uplink control channel) is a physical layer control channel, and is used for the UE to transmit information related to the auxiliary scheduling without authorization.
  • E-RUCCH uses random access physical channel resources;
  • the E-HICH (E-DCH Hybrid Automatic Repeat Request Indication Channel) is a physical layer control channel for the Node B to carry HARQ (Hybrid Automatic Repeat Request) indication information.
  • HSUPA services are classified into scheduling services and non-scheduled services according to different scheduling modes.
  • the resource of the service is allocated by the SRNC (Serving Radio Network Controller) for the UE, and the allocation mode is the same as the existing dedicated channel allocation mode.
  • the SRNC allocates an enhanced uplink resource pool for the NodeB, and the Node B is a single
  • the UE allocates resources, and the Node B sends absolute authorization information to the UE through the E-AGCH channel, including power grant information and physical channel grant information.
  • the power grant information is used to allocate available system interference resources among the competing UEs; the physical channel grant information is used to allocate time slots and code resources used by the E-PUCH among the competing UEs.
  • the authorization information on one E-AGCH is used only once for one UE.
  • the minimum duration for which the authorization applies is an E-DCH TTI.
  • Variable-length authorization can also be supported by using RDI (Resource Duration Indicator).
  • RDI can indicate The UE uses the authorization resource in the next 8 TTIs.
  • UE on a set of E-AGCH channel to listen to from the set E-AGCH channels are configured for the UE by the network level, UE - once decoded successfully reads authorization information therein, and the timing time a predetermined protocol n E. After the AGCH, data is transmitted through the authorized E-PUCH channel.
  • the Node B decodes the received E-PUCH channel data, and returns an ACK on the E-HICH channel after the decoding succeeds; if it is unsuccessful, it returns a NACK, and the UE needs to perform retransmission processing according to the retransmission mechanism.
  • the UE needs to report some information to assist the scheduling of the NodeB.
  • the information includes the UE buffer information, the power headroom, and the path loss measurement information of the local cell and the neighboring cell.
  • the secondary scheduling information will be transmitted through the E-PUCH channel; when there is no authorization, it will be sent through the E-RUCCH channel.
  • the UE When the UE has uplink data to be transmitted, it may trigger the transmission of the auxiliary scheduling information.
  • the authorization information is not sent to the UE in each port, and the scheduling function entity of the Node B determines whether/when it is sent according to the current network condition and the priority status of each competing UE.
  • the working process of the HSUPA scheduling service is as shown in FIG. 1.
  • the UE Before step 101, the UE establishes an RRC (Radio Resource Control) connection with the SRNC, where the connection reason of the UE is to initiate a packet service, and the steps in FIG. 1 are specifically described as follows:
  • RRC Radio Resource Control
  • the SRNC passes the admission control process, and considers that an enhanced uplink can be established for the UE, and the radio link establishment process is initiated to the Node B by using the NBAP (Node B Application Protocol) protocol, where the parameters related to the enhanced uplink access, such as transmission, are transmitted.
  • NBAP Node B Application Protocol
  • Channel-related information, E-DCH service radio link number, etc. If a radio link has been established for the UE before, the configuration of the enhanced uplink parameters will be performed through the radio link reconfiguration procedure.
  • the Node B receives the configuration parameter, and allocates an E-AGCH channel and an E-RNTI (E-DCH radio link temporary identifier) to the UE from the enhanced uplink common resource pool of the cell, and establishes a response by using the NBAP radio link. Or the radio link reconfiguration response is returned to the SRNC.
  • E-AGCH E-AGCH channel and an E-RNTI (E-DCH radio link temporary identifier)
  • the SRNC initiates a radio bearer setup command to the UE by using an RRC protocol, where there are E-DCH transport channel configuration information, E-PUCH related information, E-AGCH channel information, E-HICH channel information, etc.;
  • E-DCH transport channel configuration information E-PUCH related information
  • E-AGCH channel information E-AGICH channel information
  • E-HICH channel information etc.
  • the UE receives the configuration parameter, and returns a response message to the network side; determining, according to the configuration parameter, that the E-DCH transmission service starts to be available.
  • the UE When the amount of data in the logical channel buffer corresponding to the UE E-DCH changes from 0 to non-zero, the UE initiates an E-RUCCH random access procedure, and carries the auxiliary scheduling information.
  • the Node B After detecting the random access request of the UE, the Node B joins the UE to the contention UE group that uses the E-DCH resource, according to the resource status of the cell, the QOS attribute of the enhanced uplink radio bearer of the UE, and the UE auxiliary scheduling information. The UE is scheduled, and after allocating appropriate resources, the authorization information is sent to the UE through the E-AGCH channel.
  • the UE After receiving the E-AGCH, the UE sends data on the authorized E-PUCH after the timing time specified by the protocol n E-AGCH ; if the UE buffer has data to be transmitted, the auxiliary scheduling information will also follow send.
  • the Node B decodes the data on the E-PUCH channel and returns ACK/NACK information on the E-HICH channel.
  • the Node B If the last application time of the E-AGCH has arrived, the Node B continues to allocate resources for the UE according to the scheduling policy, and sends the authorization information through the E-AGCH channel.
  • n E is the timing interval between the E-AGCH and the subsequent E-PUCH first time slot, determined by the protocol; n CH is the last in an E-DCH TTI The timing interval between an E-PUCH slot and the corresponding E-HICH is selected by the Node B. Configured to the UE through the SRNC.
  • E-AGCH Enhanced Uplink Random Access Uplink Control Channel
  • E-RUCCH is a random access physical channel. In TD-SCDMA, random access needs to go through an uplink synchronization process.
  • the uplink synchronization process is performed by transmitting an uplink synchronization code in the UpPTS (uplink pilot time slot) and in the corresponding FPACH (
  • the fast physical access channel is completed by receiving timing and power adjustment information on the channel.
  • the E-RUCCH is a common channel, and there is a possibility of conflict. Frequent initiation of E-RUCCH access not only wastes network resources, but also makes the UE consume power. In addition, if the Node B does not have suitable resources, it can be scheduled. Send E-RUCCH immediately and you will not get a response.
  • an object of the present invention is to provide a time division synchronous code division multiple access system and a control method for enhancing uplink random access in a high speed uplink packet access scheduling service, including a user terminal continuing after performing an authorization transmission.
  • the application of resources is applied to enhance the control of uplink random access and the reliability control of random access. This method greatly improves the system work efficiency.
  • the present invention provides a control method for enhancing uplink random access in a time division synchronous code division multiple access system, which is characterized in that it comprises:
  • the network side upper layer configures a timer on the user terminal side; when the user terminal still needs to transmit data after the arrival of the authorized application time, the timer is started. As a delay to initiate enhanced uplink random access.
  • control method further includes:
  • the node B's authorization information is received before the timer expires, the data transmission continues; otherwise, When the timeout expires, the random access of the uplink random access uplink control channel is enhanced.
  • control method specifically includes:
  • the network side configures a timer for the user terminal side.
  • the user terminal sends new data according to the authorization information of the node B, and after the data of the last transmission time interval applicable by the absolute authorization is sent, the user terminal starts the timer;
  • step c If the user terminal receives the authorization information of the Node B before the timer expires, the timer is stopped and reset, and the process returns to step b; when the timer expires, the enhanced uplink random access is initiated. Random access of the uplink control channel, sending scheduling information to the Node B, and resetting and stopping the timer.
  • the network side is a serving radio network controller or a node B.
  • the serving radio network controller sets the timer value according to the number of enhanced uplink resources and the number of statistical users in the cell.
  • the upper limit of the timer value is the maximum interval of the synchronization command. time.
  • the node B forwards the timer value to the user terminal by using the serving wireless network controller.
  • the auxiliary terminal may carry the auxiliary scheduling information.
  • step c the user terminal performs the random access of the enhanced uplink random access uplink control channel, which means that the random access of the enhanced uplink random access uplink control channel is periodically triggered until the node B is received. Authorization.
  • step c the user terminal performs the random access of the enhanced uplink random access uplink control channel, which means that the random access of the enhanced uplink random access uplink control channel is periodically triggered until the number of triggers exceeds The maximum number of attempts or until the authorization of the Node B is received.
  • the present invention also provides a time division synchronous code division multiple access system capable of controlling enhanced uplink random access, including a user terminal, a Node B, and a serving radio network controller, wherein: the user terminal includes a timer The user terminal is configured to start the timer when data needs to be transmitted after the arrival of an authorized application time; and is further configured to continue to transmit data when receiving the authorization information of the Node B before the timer expires; otherwise, the timer is The random access of the uplink random access uplink control channel is enhanced when the timeout occurs.
  • the serving network radio controller is configured to set the value of the timer according to the number of enhanced uplink resources and the number of statistical users in the cell, and include the value in the radio bearer setup or the radio bearer reconfiguration command.
  • the user terminal is configured to configure the timer according to the value.
  • the node B is configured to set a value of the timer and is carried in a response message fed back to the serving network wireless controller;
  • the serving network wireless controller is configured to establish or radio bearer reconfiguration in the radio bearer The command forwards the information to the user terminal;
  • the user terminal is configured to configure the timer according to the value.
  • the user terminal performs the random access of the enhanced uplink random access uplink control channel, that is, the user terminal periodically triggers the random access of the enhanced uplink random access uplink control channel until receiving the authorization of the node B. .
  • the user terminal performs the random access of the enhanced uplink random access uplink control channel, that is, the user terminal periodically triggers the random access of the enhanced uplink random access uplink control channel until the number of triggers exceeds the maximum attempt. The number of times or until the authorization of the Node B is received.
  • the present invention can control the UE to initiate an enhanced uplink random access delay after an authorization according to the network side's ability to control the E-DCH resources, and avoid invalid random access; and provide enhanced uplink random access.
  • Reliability mechanism The method enables the system resources to be reasonably utilized and greatly improves the system work efficiency.
  • BRIEF abstract 1 is a flow chart of a prior art enhanced uplink configuration and data transmission;
  • FIG. 2 is a flowchart of a specific implementation of a method for controlling uplink random access in a TD-SCDMA system according to the present invention
  • FIG. 3 is a flow chart of signaling configuration and data transmission of the method of the present invention.
  • the present invention provides a method for enhancing uplink random access in the HSUPA scheduling service, which can prevent the UE from performing invalid random access.
  • the following uses the TD-SCDMA system as an example, as shown in FIG. 2 , including the following steps:
  • the UE when the network side configures the E-DCH type radio resource for the UE, the UE is configured with a timer T-WAIT for controlling the UE to initiate random connection when the E-AGCH authorization expires and data still needs to be transmitted.
  • the delay time of the entry, the timer value T_WAIT is configured by the network side when establishing or reconfiguring the E-DCH type radio resource for the UE.
  • the network side is a serving radio network controller or a node B. - -
  • the T-WAIT timer is used to avoid unnecessary random access and waste network resources. Therefore, its configuration needs to be consistent with the scheduling frequency of the network.
  • Solution 1 T-WAIT
  • the timer is configured by the SRNC.
  • the SRNC estimates the large value of the T-WAIT timer value, ie, the length of the timing time, according to the number of HSUPA resources of the serving cell and the number of statistical users.
  • the T-WATI timer reflects the Node B to a single UE.
  • Table 1 shows the parameter configuration of T-WAIT.
  • the "M" in the "Presence” column indicates that the element is required.
  • this element exists in the process related to radio bearer configuration/reconfiguration, physical resource configuration/reconfiguration, and includes the following radio resource control message (RRC message): CELL UPDATE CONFIRM, PHYSICAL CHANNEL RECONFIGURATION, RADIO BEARER RECONFIGURATION, RADIO BEARER RELEASE, RADIO BEARER SETUP, RRC CONNECTION SETUP, TRANSPORT CHANNEL RECONFIGURATION (Transport Channel Reconfiguration).
  • RRC message CELL UPDATE CONFIRM, PHYSICAL CHANNEL RECONFIGURATION, RADIO BEARER RECONFIGURATION, RADIO BEARER RELEASE, RADIO BEARER SETUP, RRC CONNECTION SETUP, TRANSPORT CHANNEL RECONFIGURATION (Transport Channel Reconfiguration).
  • the T-WATI timer is configured by the Node B. Because the Node B has the scheduling control right of the E-DCH resource, it grasps the information about the resource status, the number of users, and the interference situation of the current cell HSUPA. The Node B according to its own resources. The scheduling algorithm selects the T-WAIT timer value for the UE.
  • the E-DCH resource scheduling algorithm of the Node B is based on the specific implementation of the Node B.
  • the factors to be considered include the HSUPA resource situation in the cell, the number of users, the interference suppression requirement of the E-DCH link of the local cell, and the E-DCH link pair of the local cell.
  • Interference suppression requirements of the neighboring cell, scheduling priority of the UE (this value is obtained from the QOS attribute of the quality of service of the radio bearer provided by the SRNC).
  • the current uplink synchronization mechanism of the E-PUCH has not been determined.
  • the synchronization of the uplink DPCH (dedicated physical channel) is controlled by the synchronization command SS of the Node B in the corresponding downlink physical channel.
  • the uplink synchronization of the E-PUCH can be controlled by the SS command on the E-AGCH channel.
  • the UE can use the downlink DPCH (if any) or other downlink channel, such as HS-SCCH (High Speed Sharing).
  • the SS command in the control channel adjusts the synchronization of the uplink.
  • the UE will rely entirely on the SS command on the E-AGCH. If the UE does not receive the E-AGCH after a long period of time after transmitting the E-PUCH, the UE will lose the synchronization of the E-PUCH and need to perform the uplink synchronization process again. Since the synchronization control is completely responsible by the Node B, when the Node B configures the T_WAIT timer value for the UE, the synchronization holding mechanism of the E-PUCH (Enhanced Uplink Physical Channel) link of the UE may be considered, and the E-PUCH uplink synchronization of the UE is maintained. When relying entirely on the SS command on the E-AGCH channel, the upper limit of the T-WAIT timer value shall be the maximum interval of the SS command required for uplink synchronization.
  • the E-PUCH Enhanced Uplink Physical Channel
  • the T-WAIT timer parameter configuration in the above scheme 2 is also referred to Table 1, but it appears in both the NBAP message and the radio resource control RRC message.
  • this element is configured in the response message of the following procedure: RL Setup Request, RL Addition Request, RL Reconfiguration Prepare I Request (wireless chain) Road reconfiguration preparation/request);
  • this element is configured with the radio bearer / Reconfiguration, physical resource configuration / reconfiguration related processes exist, and the first solution is consistent.
  • the UE sends data according to the authorization information of the Node B. After the data of the last TTI applied by the latest E-AGCH authorization, that is, the current E-AGCH authorization, is sent, if there is still data to be sent, the UE Start the timer T-WAIT.
  • the auxiliary scheduling information may be carried (the event triggering mechanism may be triggered to trigger the sending of the auxiliary scheduling information, specifically The UE's upper layer decides whether to send the auxiliary scheduling information.
  • Node B saves and always uses the latest auxiliary scheduling information for scheduling. The worst case is that during the last authorization period, the data sent by the UE is unsuccessful. Since the priority of retransmission is higher than the transmission of new data, Node B should give priority to the resource authorization of the retransmission packet. The transmitted resource, Node B will be scheduled according to the last received auxiliary scheduling information.
  • the frequency at which the Node B sends the E-AGCH to a certain UE is the fastest. Each TTI is transmitted. However, the TD-SCDMA is a resource-constrained system. The frequency of the E-AGCH is often slow. In the case of serious cell interference, Or because of the need for congestion control, Node B may even temporarily suspend the transmission of authorization information.
  • the timer T-WAIT After the UE sends the last TTI data within the last E-AGCH authorization period, if there is still data to be transmitted at this time, the timer T-WAIT will be started, in which the next authorization is waiting for Node B, and the other is Aspects of this timer T-WAIT may also be the limit of E-PUCH uplink synchronization.
  • the third step if the UE receives the authorization information of the service node B before the timer T_WAIT times out, resets and stops the timer T_WAIT, and performs the next operation according to the authorized content, for example, returns to the second step; After the timer expires, the timer T_WAIT is reset and stopped, and random access of the E-RUCCH (Enhanced Uplink Random Access Control Channel) is performed.
  • E-RUCCH Enhanced Uplink Random Access Control Channel
  • the UE After receiving the authorization information of the service node B, the UE restarts the data transmission process according to the process of the second step; if the timer T_WAIT times out, it means that the 4 authorized information of the service node B has not been received yet.
  • the uplink synchronization and E-RUCCH access will be performed.
  • the timer T_WAIT provided by the present invention is a delay time for the UE to wait for uplink random access and continue to apply for scheduling resources after the end of the authorized application time.
  • the UE When the UE initiates the random access of the E-RUCCH, it will access according to the original PRACH (Physical Random Access Channel) random access procedure of the system, and the E-RUCCH is a competitive collision channel, and the access process has uncertainty. If the authorization of the Node B is not received within a certain period of time, the data may be successfully sent through a certain mechanism, such as a periodic timer + a maximum number of attempts, or a simple periodic timer mechanism.
  • a periodic timer + a maximum number of attempts or a simple periodic timer mechanism.
  • the terminal After issuing the first E-RUCCH access, the terminal starts the periodic timer T_RUCCH and starts the counter.
  • the E-RUCCH is triggered periodically. Each time the E-RUCCH is sent, the counter is incremented by 1, until the maximum number of attempts is exceeded, or the authorization of Node B is received. If the user terminal does not receive the authorization of the Node B after the maximum number of attempts arrives, the next step of the user terminal determines the next operation.
  • the value of the periodic timer T RUCCH and the maximum number of attempts can be set by the network upper layer.
  • the terminal In a simple periodic timer mechanism, the terminal is not limited by the maximum number of attempts, and periodically triggers random access of the E-RUCCH until the authorization of the NodeB is received.
  • the above E-RUCCH random access reliability control method is also applicable to the initial random access procedure when the terminal buffer data changes from 0 to non-zero.
  • FIG. 3 is a diagram showing an E-PUCH radio link configuration process and a data transmission process of the UE in the present invention.
  • the UE Before step 201, the UE establishes an RRC (Radio Resource Control) connection with the SR C.
  • RRC Radio Resource Control
  • the SRNC passes the admission control to establish that an enhanced uplink can be established for the UE, and the Node B is required to establish an E-PUCH radio link for the UE, including the HSUPA, through the radio link establishment process of the NBAP protocol or the radio link reconfiguration process.
  • Related parameters such as transport channel related information, E-DCH service radio link number, etc.; if a radio link has been established for the UE before, the HSUPA parameter configuration will be performed through the radio link reconfiguration process;
  • the Node B receives the configuration parameter, and allocates an E-AGCH channel, an E-HICH channel, and an E-RNTI (Radio Link Temporary Identity) to the UE from the enhanced uplink common resource pool of the cell, and the wireless link through the NBAP
  • the establishment response or the radio link reconfiguration response is returned to the SRNC.
  • the response message further includes the T-WAIT value selected by the Node B for the UE.
  • the SRNC initiates a radio bearer setup command to the UE by using an RRC protocol, where the E-DCH transport channel configuration information, the E-PUCH related information, the E-AGCH channel information, the E-HICH channel information, and the like, the T-WAIT information, and the like. If there has been a radio bearer setup procedure before, the radio bearer reconfiguration process will be used to enhance the uplink access related configuration.
  • the T_WAIT value is selected by the SRNC for the UE; when the foregoing solution 2 is adopted, the T-WAIT value is configured by the Node B, and is forwarded by the SRNC to the UE;
  • the UE receives the configuration parameter, and returns a response message to the network side; determining, according to the configuration parameter, that the current E-DCH transmission service is available;
  • the UE When the amount of data in the logical channel buffer corresponding to the UE E-DCH changes from 0 to 0, the UE initiates an E-RUCCH random access procedure, and carries the auxiliary scheduling information.
  • the Node B After detecting the random access request of the UE, the Node B joins the UE to the contention UE group that uses the E-DCH resource, and performs the UE according to the current resource status, the QoS attribute of the UE, and the UE auxiliary scheduling information. Scheduling, after allocating appropriate resources, sending authorization information to the UE through the E-AGCH channel;
  • the UE After receiving the authorization information in the E-AGCH , the UE sends data on the authorized E-PUCH after the timing time n E-AGCH . If the UE buffer has data to be transmitted, the auxiliary scheduling information will also be If the resource is not authorized after the current TTI, that is, the current one is the last one for the last absolute grant, if the UE still has data to be transmitted, the UE sends the data in the current TTI on the E-PUCH. After starting the timer T-WAIT;
  • Node B decodes the data on the E-PUCH channel and returns ACK/NACK information on the E-HICH channel.
  • step 207 if the UE starts the timer T_WAIT, there are two possible cases: Case 1: 209: Before the timer expires, the UE receives the E-AGCH authorization information of the Node B, then resets and stops the The timer repeats from step 207 to continue transmitting data. Case 2: 210: The timer expires, the UE resets and stops the timer, and then steps are performed.
  • Steps 209, 210 and 208 can be in parallel.
  • the UE periodically triggers the E-RUCCH according to the periodic timer T RUCCH, and each trigger The value of the counter is incremented by one at a time until the number of triggers is one, that is, the value of the counter exceeds the maximum number of attempts or until the authorization of the Node B is received; after receiving the authorization information of the Node B, it is repeated from 207.
  • the counter is a specific implementation, and other methods can be used as long as the recording of the number of triggers can be realized.
  • the number of triggers may not be counted in step 211, and the E-RUCCH is triggered periodically until authorization is obtained.
  • the present invention also provides a TD-SCDMA system capable of performing enhanced uplink random access control, including UE, Node B, and SRNC.
  • the SRNC is configured to establish an E-PUCH radio link for the UE by using a radio link establishment procedure of the NBAP protocol when the enhanced control is established by the admission control to establish an enhanced uplink for the UE that initiates the connection, where the HSUUP is associated with the HSUPA.
  • Parameters such as transport channel related information, E-DCH service radio link number, etc.; if the UE is already in the connected state and has previously established a radio link for the UE, the HSUPA parameter will be performed through the radio link reconfiguration procedure.
  • the configuration is further configured to: after receiving the response returned by the Node B, initiate a radio bearer setup command to the UE by using an RRC protocol, where the E-DCH transport channel configuration information, the E-PUCH related information, the E-AGCH channel information, E-HICH channel information, etc., timer T-WAIT information, etc.; If there has been a radio bearer setup procedure before, then the uplink bearer related configuration will be enhanced by the radio bearer reconfiguration procedure. If there is a timer T_WAIT information in the response returned by the Node B, the SRNC is only used to forward the information to the user terminal in the radio bearer setup or radio bearer reconfiguration command; otherwise, the SRNC is also used to enhance the uplink according to the cell. The number of resources of the road and the number of statistical users are used to set the timer T-WAIT value, and the value is included in the radio bearer setup or radio bearer reconfiguration command and sent to the UE.
  • the Node B is configured to receive configuration parameters sent by the SRNC, and allocate an E-AGCH channel, an E-HICH channel, and an E-RNTI to the UE that initiates the connection from the enhanced uplink common resource pool of the cell. Identification), returning to the SRNC through the radio link setup response or radio link reconfiguration response of the NBAP; when the timer T-WAIT is configured by the Node B, the Node B is also used to select a timer for the UE that initiates the connection The T-WAIT value is carried in the response message fed back to the SRNC.
  • the Node B is further configured to use UE 0 QOS according to current resource status.
  • Attributes, UE-assisted scheduling information, and the like are scheduled for the UE, and after the appropriate resources are allocated to the UE, the authorization information is sent to the UE through the E-AGCH channel; the Node B is also used to send the UE on the E-PUCH channel.
  • the data is decoded and correspondingly ACK/NACK information is returned to the UE on the E-HICH channel.
  • the UE includes a timer T-WAIT; the UE is used to initiate a connection, and is received
  • the response message is sent to the network side; then, according to the configuration parameter, it is determined that the current E-DCH transmission service is available, and the timer is configured according to the T_WAIT value therein; and is also used for the logic corresponding to the UE E-DCH.
  • the E-RUCCH random access procedure is initiated and carries the auxiliary scheduling information; and is also used to receive the authorization information in the E-AGCH, at the timing time n E A
  • the data is sent on the authorized E-PUCH. If the UE buffer has data to be transmitted, the auxiliary scheduling information will also be sent.
  • the current absolute authorization is the last one.
  • the UE starts the timer T_WAIT after transmitting the data in the current TTI on the E-PUCH; and is also used to receive the Node B before the timer expires.
  • the E-AGCH grants information to reset and stop the timer, and after the timer T_WAIT times out, resets and stops the timer T_WAIT, and then initiates a random access procedure of the E-RUCCH.
  • the UE initiates the E-RUCCH random access procedure by: the UE periodically triggers the E-RUCCH according to the periodic timer T-RUCCH, and increments the counter value by one every time the trigger is triggered until the number of triggers is one. The value exceeds the maximum number of attempts or until the authorization of Node B is received. Of course, in actual applications, the number of triggers may not be counted, and the E-RUCCH is always triggered periodically until authorization is obtained.
  • the counter is a specific implementation, and other methods can be used as long as the number of triggers can be recorded.
  • the invention can control the delay of the random access by the UE after the primary authorization according to the control capability of the E-DCH resource on the network side, and avoid invalid random access, so that the system resources can be reasonably utilized;
  • the conflicting nature provides a reliable transmission method for random access.
  • the invention can control the UE to initiate the enhanced uplink random access delay after one authorization, avoid invalid random access, save resources, and save the uplink according to the network side's ability to control the E-DCH resources.
  • the reliability mechanism of random access This method enables system resources to be reasonably utilized and greatly improves system efficiency.

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Description

TD-SCDMA系统及其中 HSUPA随机接入的控制方法
技术领域
本发明涉及无线通讯领域，尤其涉及一种时分同步码分多址系统及其中 增强上行链路随机接入的控制方法。
背景技术
才艮据 2006年 3月， 3GPP ( 3rd Generation Partnership Project )通过了 TD-SCDMA (时分同步码分多址） 系统增强上行链路的立项申请。 增强上 行链路一般被称为 HSUPA ( High Speed Uplink Packet Access， 高速上行分组 接入） ， 旨在通过先进的技术提高上行链路的效率， 以有效的支持 web 浏 览、 视频、 多媒体信息和其他基于 IP的业务。
目前 3GPP的 TD-SCDMA上行增强技术尚未形成完整的技术报告， 但 基本的技术框架已经显现，可以参考 3GPP 5月上海会议的提案和会议报告， 与本发明相关的技术框架在下面描述。
HSUPA中新增了一个传输信道 E-DCH(增强上行链路专用传输信道） , 增强上行数据承载在该传输信道上， E-DCH的 TTI (传输时间间隔）为 5ms。
与 E-DCH匹配的物理信道有：
E-AGCH信道（ E-DCH绝对授权信道）， 是控制信道， 用于 Node B (节 点 B )传输授权信息； E-PUCH ( E-DCH上行物理信道， 又称增强上行物理 信道） ， 是业务信道， 用于 UE ( User Equipment, 用户终端）承载 E-DCH 类型的编码组合传输信道， 辅助调度相关的信息也在该信道上传输；
E-RUCCH ( E-DCH随机接入上行控制信道， 即强上行链路随机接入上 行控制信道） , 是物理层控制信道， 用于 UE在无授权的情况下， 传输辅助 调度相关的信息， E-RUCCH使用随机接入物理信道资源；
E-HICH ( E-DCH混合自动重传请求指示信道） ， 是物理层控制信道， 用于 Node B携带 HARQ (混合自动重传请求 )指示信息。
HSUPA业务按调度方式的不同分为调度业务和非调度业务， 其中非调 度业务的资源由 SRNC (服务无线网络控制器） 为 UE分配， 分配方式同现 有的专用信道分配方式； 在调度业务中， 由 SRNC为 NodeB分配增强上行 链路资源池， 由 Node B为单个 UE分配资源， Node B通过 E-AGCH信道向 UE发送绝对授权信息， 其中包括功率授权信息和物理信道授权信息。 功率 授权信息用于在各竟争 UE之间分配可用的系统干扰资源； 物理信道授权信 息用于在各竟争 UE之间分配 E-PUCH使用的时隙和码资源。一条 E-AGCH 上的授权信息一次只给一个 UE 使用， 授权适用的最小持续时间是一个 E-DCH TTI, 也可以通过使用 RDI (资源持续时间指示）支持可变长度的授 权， 比如 RDI可以指示 UE在接下来的 8个 TTI中使用该授权资源。 UE对 一组 E-AGCH信道进行侦听， 这组 E-AGCH信道是由网络高层为 UE配置 的， UE —旦解码成功就读取其中的授权信息， 并在协议规定的定时时间 nE.AGCH后通过授权的 E-PUCH信道发送数据。 Node B对接收的 E-PUCH信 道数据进行解码， 解码成功后在 E-HICH信道上返回 ACK; 不成功则返回 NACK, 此时 UE需要根据重传机制进行重传处理。
在调度业务中， UE需要上报一些信息以辅助 NodeB的调度， 这些信息 包括 UE緩沖区信息、 功率余量、 本小区和邻小区的路损测量信息等。 当 UE有授权的 E-PUCH时， 辅助调度信息将通过 E-PUCH信道发送； 当没有 授权时， 将通过 E-RUCCH信道发送。 当 UE有上行数据需要发送时， 就可 能触发辅助调度信息的发送。 授权信息并不在每个 ΤΉ中向 UE发送， 完全 由 Node B的调度功能实体才艮据当前网络状况和各竟争 UE的优先级情况来 决定是否 /何时发送。
HSUPA调度业务的工作过程如附图 1所示， 在步骤 101之前， UE与 SRNC建立了 RRC (无线资源控制）连接， 其中 UE的连接原因是发起分组 业务， 图 1中各步骤具体说明如下：
101 : SRNC经过接纳控制过程， 认为可以为该 UE建立增强上行链路， 通过 NBAP (节点 B应用协议）协议向 Node B发起无线链路建立过程， 其 中含增强上行接入相关的参数， 如传输信道相关的信息、 E-DCH服务无线 链路号等； 如果之前已为该 UE建立过无线链路， 那么将通过无线链路重配 置过程进行增强上行参数的配置。 102: Node B接收配置参数， 并从该小区的增强上行公共资源池中为该 UE分配 E-AGCH信道和 E-RNTI ( E-DCH无线链路临时标识），通过 NBAP 的无线链路建立响应或无线链路重配置响应返回给 SRNC。
103: SRNC通过 RRC协议向 UE发起无线承载建立命令，其中有 E-DCH 传输信道配置信息、 E-PUCH相关的信息、 E-AGCH信道信息、 E-HICH信 道信息等； 如果之前已经有过无线承载建立过程， 那么将通过无线承载重配 置过程进行增强上行接入相关的配置。
104: UE接收配置参数， 并向网络侧回复响应消息； 根据配置参数确定 E-DCH传输业务开始可用。
105: UE E-DCH对应的逻辑信道緩冲区中数据量由 0变为非 0时， UE 发起 E-RUCCH随机接入过程， 带上辅助调度信息。
106: Node B检测到该 UE的随机接入请求后， 将 UE加入使用 E-DCH 资源的竟争 UE群中， 根据小区资源状况、 UE的增强上行无线承载的 QOS 属性、 UE 辅助调度信息等对该 UE 进行调度， 分配合适的资源后通过 E-AGCH信道向 UE发送授权信息。
107: UE收到 E-AGCH后， 在协议规定的定时时间 nE-AGCH后， 在授权 的 E-PUCH上发送数据； 若 UE緩冲区还有数据待传输， 辅助调度信息也将 随之发送。
108： Node B对 E-PUCH信道上的数据进行解码 , 并在 E-HICH信道上 返回 ACK/NACK信息。
109: 如果上一次 E-AGCH的授权适用时间已到， Node B根据调度策略 继续为该 UE分配资源， 通过 E-AGCH信道发送授权信息。
110-111 : 同步骤 107和 108。
112: UE緩冲区中还有数据需要发送， 但当前没有授权信息时， 通过 E-RUCCH申请资源。
存在两种确定的时序关系： 其中 nE.A(5CH是 E-AGCH与其后的 E-PUCH 第一个时隙之间的定时间隔， 由协议确定； n CH是一个 E-DCH TTI中最后 一个 E-PUCH时隙与相应的 E-HICH之间的定时时间间隔，由 Node B选择， 通过 SRNC向 UE配置。
目前存在的问题是， 在调度业务中， 当一次 E-AGCH授权适用的时间 到达后， 如果 UE还有数据需要发送， 而此时 Node B没有合适的资源调度 给该 UE, 也就是 UE没有及时收到下一个 E-AGCH, 是立即通过 E-RUCCH (增强上行链路随机接入上行控制信道）发送辅助调度信息， 还是继续侦听 E-AGCH信道。 E-RUCCH是随机接入物理信道， 在 TD-SCDMA中， 随机 接入需要经过上行同步过程， 上行同步过程是通过在 UpPTS (上行导频时 隙）发送上行同步码， 并在相应的 FPACH (快速物理接入信道）信道上接 收定时、 功率调整信息来完成的， 具体可以参考 3GPP TS25.224协议， 接入 过程比较复杂。 且 E-RUCCH是个公共信道， 存在竟争冲突的可能， 频繁的 发起 E-RUCCH接入，不仅浪费网络资源，也使 UE非常耗电；另外如果 Node B没有合适的资源可以调度， 此时即使马上发送 E-RUCCH, 也将得不到响 应。
此外， 由于 E-RUCCH信道的竟争性， 还需要考虑 E-RUCCH信道的可 靠性传输机制， 确保节点 B能够正确接收终端的调度请求。
发明内容
为了克服上述缺陷 ,本发明的目的在于提供一种时分同步码分多址系统 及其中高速上行分组接入调度业务中增强上行随机接入的控制方法，包括用 户终端在进行一次授权传输后，继续申请资源而进行增强上行链路随机接入 的控制， 及随机接入的可靠性控制。 该方法大大提高系统工作效率。
本发明提供了一种时分同步码分多址系统增强上行链路随机接入的控 制方法， 其特征在于， 包括：
在时分同步码分多址系统的高速上行分组接入调度业务中，网络侧高层 在用户终端侧配置定时器； 用户终端在一次授权适用时间到达后， 仍需传输 数据时， 启动所述定时器作为发起增强上行链路随机接入的延迟时间。
进一步的， 所述控制方法还包括：
如果在定时器超时前收到节点 B的授权信息则继续传输数据；否则在定 时器超时时进行增强上行链路随机接入上行控制信道的随机接入。
进一步的， 所述控制方法具体包括：
a、 网络侧为用户终端侧配置一个定时器；
b、 用户终端按照节点 B的授权信息发送新数据， 在绝对授权适用的最 后一个传输时间间隔的数据发出后， 用户终端启动所述定时器；
c、 若在所述定时器超时前， 用户终端收到了节点 B的授权信息， 则停 止并复位该定时器， 返回步骤 b; 在所述定时器超时之时， 发起增强上行链 路随机接入上行控制信道的随机接入， 向节点 B 发送调度信息， 并复位和 停止所述定时器。
进一步的， 所述步骤（1 ) 中， 所述网络侧为服务无线网络控制器或者 节点 B。
进一步的，所述步骤 a中：所述定时器值若由服务无线网络控制器配置， 服务无线网络控制器根据小区中增强上行链路的资源数和统计用户数来设 置所述定时器值。
进一步的， 所述步骤 a中： 所述定时器值若由节点 B配置， 且当增强上 行物理信道的同步命令由 E-AGCH信道承载时， 所述定时器值的上限为同 步命令的最大间隔时间。
进一步的， 所述定时器值若由节点 B配置， 则节点 B通过服务无线网 络控制器将该定时器值转发给用户终端。
进一步的，所述步骤 b中，用户终端按照节点 B的授权信息发送新数据 时，若增强上行链路专用传输信道对应的逻辑信道緩沖区中仍有数据需要发 送， 则可以携带上辅助调度信息。
进一步的， 步骤 c中， 用户终端进行增强上行链路随机接入上行控制信 道的随机接入是指：周期性地触发增强上行链路随机接入上行控制信道的随 机接入直到接收到节点 B的授权。
进一步的， 步骤 c中， 用户终端进行增强上行链路随机接入上行控制信 道的随机接入是指：周期性地触发增强上行链路随机接入上行控制信道的随 机接入， 直到触发次数超过最大尝试次数或直到接收到节点 B的授权。 本发明还提供了一种能够控制增强上行链路随机接入的时分同步码分 多址系统， 包括用户终端、 节点 B 和服务无线网络控制器， 其特征在于： 所述用户终端包括一定时器，所述用户终端用于在一次授权适用时间到达后 仍需传输数据时， 启动所述定时器； 还用于在定时器超时前收到节点 B 的 授权信息时继续传输数据；否则在定时器超时时进行增强上行链路随机接入 上行控制信道的随机接入。
进一步的，所述服务网络无线控制器用于根据小区中增强上行链路的资 源数和统计用户数设置所述定时器的值，并将该值包含在无线承载建立或者 无线承载重配置命令中发给用户终端；所述用户终端用于按照该值配置所述 定时器。
进一步的，所述节点 B用于设置所述定时器的值并携带在反馈给服务网 络无线控制器的响应消息中；所述服务网络无线控制器用于在所述无线承载 建立或者无线承载重配置命令中转发该信息给用户终端；所述用户终端用于 按照该值配置所述定时器。
进一步的，用户终端进行增强上行链路随机接入上行控制信道的随机接 入是指：用户终端周期性地触发增强上行链路随机接入上行控制信道的随机 接入直到接收到节点 B的授权。
进一步的，用户终端进行增强上行链路随机接入上行控制信道的随机接 入是指：用户终端周期性地触发增强上行链路随机接入上行控制信道的随机 接入， 直到触发次数超过最大尝试次数或直到接收到节点 B的授权。
本发明可以根据网络侧对 E-DCH资源的掌控能力， 控制 UE在一次授 权后发起增强上行链路随机接入的时延，避免无效的随机接入； 同时提供了 增强上行链路随机接入的可靠性机制。 本方法使系统资源能得到合理利用， 并大大提高系统工作效率。 附图概述 图 1是现有的增强上行链路配置及数据发送流程图；
图 2是本发明的 TD-SCDMA系统中增强上行链路随机接入的控制方法 的具体实施流程图； 图 3是本发明所述方法的信令配置及数据发送流程图。
本发明的较佳实施方式
本发明提供了在 HSUPA调度业务中的一种增强上行链路随机接入的方 法， 该方法能避免 UE进行无效的随机接入， 下面以 TD-SCDMA系统为例 进行介绍， 如图 2所示， 包括以下步骤：
第一步、 网络侧为 UE配置 E-DCH类型的无线资源时， 为 UE配置一 个定时器 T— WAIT,用于控制 UE在一次 E-AGCH授权期满且仍有数据需要 传输时发起随机接入的延时时间 ,该定时器值 T_WAIT由网络侧在为 UE建 立或重配置 E-DCH类型的无线资源时配置。 所述网絡侧为服务无线网络控 制器或者节点 B。 - -
T— WAIT定时器用于避免用户作无谓的、频繁的随机接入， 浪费网络资 源， 因而它的配置需要与网络侧调度频度保持一致， 有两种方案， 分别为： 方案一： T— WAIT定时器由 SRNC配置， SRNC根据 UE所在的服务小 区 HSUPA资源数和统计用户数来估计 T— WAIT定时器值的大' j 即定时 时间的长短, T— WATI定时器体现了 Node B对单个 UE调度的平均频度。 下 表 1是 T— WAIT的参数配置情况，"存在"一栏中的" M"表示该元素是必须的。 在 RRC协议中， 该元素在与无线承载配置 /重配置、物理资源配置 /重配置相 关的过程中存在， 包括如下无线资源控制消息（RRC消息）： CELL UPDATE CONFIRM (小区更新确认）、 PHYSICAL CHANNEL RECONFIGURATION (物理信道重配置）、 RADIO BEARER RECONFIGURATION (无线承载重 配置） 、 RADIO BEARER RELEASE (无线承载释放） 、 RADIO BEARER SETUP (无线承载建立）、 RRC CONNECTION SETUP (无线资源控制连接 建立）、 TRANSPORT CHANNEL RECONFIGURATION (传输信道重配置）。 元素名 存在 说明
T—WAIT M 整数
表 1
方案二： T— WATI定时器由节点 B配置， 由于节点 B具有 E-DCH资源 的调度控制权， 它掌握了当前小区 HSUPA的资源状况、 用户数、 干扰情况 等信息， 节点 B根据自己的资源调度算法为该 UE选择 T— WAIT定时器值。
节点 B的 E-DCH资源调度算法基于节点 B的具体实现， 需要考虑的 因素包括小区中 HSUPA资源情况、 用户数、 本小区 E-DCH链路的干扰抑 制要求、 本小区 E-DCH链路对邻区的干扰抑制要求、 UE的调度优先级（该 值从 SRNC提供的无线承载的服务质量要求 QOS属性中得到） 。
另外， 目前 E-PUCH的上行同步保持机制尚未确定， 在 3GPP R4/R5版 本中， 上行 DPCH (专用物理信道）的同步保持是通过节点 B在对应的下行 物理信道中的同步命令 SS 控制的， E-PUCH 的上行同步保持可以通过 E-AGCH信道上的 SS命令控制， 当 E-AGCH信道中断一段时间后， UE可 以使用下行 DPCH (如果存在）或其它下行信道， 如 HS-SCCH (高速共享 控制信道） 中的 SS命令调整上行链路的同步。 如果没有可共享的 SS命令， UE将完全依赖 E-AGCH上的 SS命令。 如果 UE在发送完 E-PUCH后的很 长一段时间后没有收到 E-AGCH, UE将失去 E-PUCH的同步， 需要重新进 行上行同步过程。 由于同步控制完全由节点 B负责， 节点 B在为 UE配置 T_WAIT定时器值时， 可以考虑 UE的 E-PUCH (增强上行物理信道）链路 的同步保持机制，当 UE的 E-PUCH上行同步保持完全依赖 E-AGCH信道上 的 SS命令时，T— WAIT定时器值的上限应是上行同步所要求的 SS命令的最 大间隔时间。
上述方案二中的 T— WAIT定时器参数配置也参照表 1 ,但它同时出现在 NBAP消息和无线资源控制 RRC消息中。 在 NBAP协议中， 该元素是在以 下过程的响应消息中配置的： RL Setup Request (无线链路建立请求） 、 RL Addition Request (无线链路增力口请求 )、 RL Reconfiguration Prepare I Request (无线链路重配置准备 /请求）； 在 RRC协议中， 该元素在与无线承载配置 /重配置、 物理资源配置 /重配置相关的过程中存在， 和方案一是一致的。 第二步， UE按照节点 B的授权信息发送数据，在最近一次 E-AGCH授 权——即当前 E-AGCH授权——适用的最后一个 TTI的数据发出后， 如仍 有数据需要发送， 则 UE启动定时器 T— WAIT。
UE在发送新数据时， 只要 E-DCH对应的逻辑信道緩冲区中仍有数据 需要传输， 就可能会带上辅助调度信息（可以按照某种事件触发机制来触发 辅助调度信息的发送， 具体由 UE高层决定是否发送辅助调度信息） , 节点 B会进行保存， 并总是使用最新的辅助调度信息进行调度。 最坏的情况是在 最近一次授权期内， UE发送的数据都没有成功， 由于重发的优先级高于新 数据的发送， 此时节点 B 应优先考虑重发分组的资源授权； 如果没有重传 的资源， 节点 B将依据最近一次收到的辅助调度信息进行调度。
节点 B对某个 UE发送 E-AGCH的频度最快是每个 TTI都会发送， 但 TD-SCDMA是资源受限系统， E-AGCH的频度往往较慢， 在小区干扰严重 的情况下， 或出于拥塞控制的需要， 节点 B 甚至会暂时中断授权信息的发 送。
当 UE在最近一次 E-AGCH授权期内发送完最后一个 TTI的数据后， 此时如果仍有数据需要传输， 将启动定时器 T— WAIT,—方面是等待节点 B 的下一次授权， 另一方面该定时器 T— WAIT也可能是 E-PUCH上行同步保 持的极限。
第三步、如果在定时器 T— WAIT超时前， UE收到了服务节点 B的授权 信息， 则复位并停止该定时器 T— WAIT, 按照授权内容进行下一步操作， 比 如返回第二步； 在定时器超时后， 复位并停止该定时器 T— WAIT, 进行 E-RUCCH (增强上行链路随机接入上行控制信道） 的随机接入。
UE收到了服务节点 B的授权信息后，将按照上述第二步的过程重新开 始一次数据发送过程； 如果在定时器 T— WAIT超时， 也就意味着还未接收 到服务节点 B的 4受权信息， 将进行上行同步及 E-RUCCH的接入， 此时需要 复位并停止该定时器 T— WAIT。 也就是说， 本发明提供的定时器 T— WAIT 是 UE在授权适用时间结束后需要等待进行上行随机接入、继续申请调度资 源的延迟时间。 UE发起 E-RUCCH的随机接入时，将按照系统原有的 PRACH (物理随 机接入信道） 随机接入流程进行接入， E-RUCCH是竟争冲突信道， 其接入 过程有着不确定性， 若在一定时间内没有接收到节点 B 的授权， 则可以通 过某种机制确保数据发送成功，如采用周期性定时器 +最大尝试次数的机制， 或单纯的周期性定时器机制。
在周期性定时器 +最大尝试次数机制中， 终端在发出第一个 E-RUCCH 接入后， 启动周期性定时器 T_RUCCH 并启动计数器。 周期性触发 E-RUCCH, 每发送一次 E-RUCCH, 计数器加 1， 直到超过最大尝试次数， 或接收到节点 B 的授权。 若用户终端在最大尝试次数到达后， 仍没有收到 节点 B 的授权， 则由用户终端高层决定下一步的操作。 周期性定时器 T RUCCH的值和最大尝试次数可由网络高层设置。
在单纯的周期性定时器机制中，终端不受最大尝试次数的限制，周期性 的触发 E-RUCCH的随机接入， 直到收到 NodeB的授权。
以上 E-RUCCH 随机接入的可靠性控制方法也适用于终端緩冲区数据 由 0变为非 0时的初始随机接入过程。
图 3是本发明中， UE的 E-PUCH无线链路配置过程及数据传输过程图， 在步骤 201之前， UE与 SR C建立了 RRC (无线资源控制）连接， 图 3中 的具体流程如下：
201 : SRNC经过接纳控制认为可以为该 UE建立增强上行链路， 通过 NBAP协议的无线链路建立过程或者无线链路重配置过程， 要求节点 B 为 UE建立 E-PUCH无线链路， 其中含 HSUPA相关的参数， 如传输信道相关 的信息、 E-DCH服务无线链路号等； 如果之前已为该 UE建立过无线链路， 那么将通过无线链路重配置过程进行 HSUPA参数的配置；
202: 节点 B接收配置参数， 并从该小区的增强上行公共资源池中为该 UE分配 E-AGCH信道、 E-HICH信道和 E-RNTI (无线链路临时标识） ， 通 过 NBAP 的无线链路建立响应或无线链路重配置响应返回给 SRNC , 当 T— WAIT定时器由节点 B来配置时，该响应消息中还包括节点 B为 UE选择 的 T— WAIT值； 203: SRNC通过 RRC协议向 UE发起无线承载建立命令，其中有 E-DCH 传输信道配置信息、 E-PUCH相关的信息、 E-AGCH信道信息、 E-HICH信 道信息等、 T— WAIT信息等； 如杲之前已经有过无线承载建立过程， 那么将 通过无线承载重配置过程进行增强上行接入相关的配置。当采用上述方案一 时， T_WAIT值是 SRNC为 UE选择的； 当采用上述方案二时， T一 WAIT值 是节点 B配置， 由 SRNC转发给 UE;
204: UE接收配置参数， 向网络侧回复响应消息； 根据配置参数确定 当前 E-DCH传输业务是可用的；
205: UE E-DCH对应的逻辑信道緩沖区中数据量由 0变为非 0时， UE 发起 E-RUCCH随机接入过程， 带上辅助调度信息；
206: 节点 B检测到该 UE的随机接入请求后， 将 UE加入使用 E-DCH 资源的竟争 UE群中， 根据当前的资源状况、 UE的 QoS属性、 UE辅助调 度信息等对该 UE进行调度， 分配合适的资源后， 通过 E-AGCH信道向 UE 发送授权信息；
207: UE收到 E-AGCH中的授权信息后， 在定时时间 nE-AGCH后， 在授 权的 E-PUCH上发送数据， 如果 UE緩冲区还有数据待传输， 辅助调度信息 也将随之发送；若当前 TTI后没有授权的资源一一即当前 ΤΉ为最近一次绝 对授权适用的最后一个 ΤΉ时，如果 UE还有数据待传输，则 UE在 E-PUCH 上发送完当前 TTI中的数据后启动定时器 T— WAIT;
208: 节点 B对 E-PUCH信道上的数据进行解码， 并在 E-HICH信道上 返回 ACK/NACK信息。
在步骤 207中， 如果 UE启动了定时器 T— WAIT, 有两种可能的情况： 情况一： 209: 在定时器超时之前， UE收到了节点 B的 E-AGCH授权 信息， 则复位并停止该定时器， 从步骤 207开始重复， 继续发送数据； 情况二： 210: 定时器超时， UE 复位并停止该定时器， 然后执行步骤
211， 即发起 E-RUCCH的随机接入过程。
步骤 209、 210与 208可以是并行的。
211 : UE按照周期性定时器 T RUCCH周期性触发 E-RUCCH, 每触发 一次就将计数器的值加 1 , 直到触发次数一一即计数器的值超过最大尝试次 数或直到接收到节点 B的授权； 接收到节点 B的授权信息后， 从 207开始 重复。 计数器为一种具体实现方式， 也可以用其它方式， 只要能实现对触发 次数的记录即可
当然实际应用中，步骤 211中也可以不对触发次数进行计数，一直周期 性触发 E-RUCCH, 直到获得授权。
本发明还提供了一种能够进行增强上行链路随机接入控制的 TD-SCDMA系统， 包括 UE、 Node B和 SRNC。
所述 SRNC用于在经过接纳控制认为可以为发起连接的 UE建立增强上 行链路时， 通过 NBAP协议的无线链路建立过程， 要求节点 B为 UE建立 E-PUCH无线链路， 其中含 HSUPA相关的参数， 如传输信道相关的信息、 E-DCH服务无线链路号等； 如果 UE已经处于连接状态、 之前已为该 UE建 立过无线链路， 那么将通过无线链路重配置过程进行 HSUPA参数的配置； 还用于在收到节点 B返回的响应后， 通过 RRC协议向 UE发起无线承载建 立命令， 其中有 E-DCH传输信道配置信息、 E-PUCH相关的信息、 E-AGCH 信道信息、 E-HICH信道信息等、 定时器 T— WAIT信息等； 如果之前已经有 过无线承载建立过程，那么将通过无线承载重配置过程进行增强上行接入相 关的配置。 如果节点 B返回的响应中有定时器 T— WAIT信息则 SRNC只用 于在所述无线承载建立或者无线承载重配置命令中转发该信息给用户终端； 否则 SRNC 还用于根据小区中增强上行链路的资源数和统计用户数来设置 所述定时器 T—WAIT值， 并将该值包含在所述无线承载建立或者无线承载 重配置命令中发给 UE。
所述节点 B用于接收所述 SRNC发送的配置参数， 并从该小区的增强 上行公共资源池中为发起连接的 UE分配 E-AGCH信道、 E-HICH信道和 E-RNTI (无线链路临时标识） ， 通过 NBAP的无线链路建立响应或无线链 路重配置响应返回给 SRNC; 当定时器 T—WAIT由节点 B来配置时， 所述 节点 B还用于为发起连接的 UE选择定时器 T—WAIT值并携带在反馈给 SRNC的响应消息中。 所述节点 B还用于根据当前的资源状况、 UE 0 QOS 属性、 UE辅助调度信息等对该 UE进行调度， 并在为 UE分配合适的资源 后， 通过 E-AGCH信道向 UE发送授权信息； 所述节点 B还用于对 E-PUCH 信道上 UE 所发的数据进行解码， 并相应在 E-HICH信道上向 UE返回 ACK/NACK信息。
所述 UE包括一定时器 T— WAIT; 所述 UE用于发起连接， 并在接收到
SNRC发送的配置参数后， 向网络侧回复响应消息； 然后根据配置参数确定 当前 E-DCH传输业务是可用的， 并按照其中的 T_WAIT值配置定时器； 还 用于当 UE E-DCH对应的逻辑信道緩冲区中数据量由 0变为非 0时， 发起 E-RUCCH随机接入过程， 并携带辅助调度信息； 还用于收到 E-AGCH中的 授权信息后， 在定时时间 nEAGCH后， 在授权的 E-PUCH上发送数据， 如果 UE緩沖区还有数据待传输， 辅助调度信息也将随之发送； 若当前 TTI后没 有授权的资源一一即当前 ΤΉ为最近一次绝对授权适用的最后一个 TTI时， 如果 UE还有数据待传输， 则 UE在 E-PUCH上发送完当前 TTI中的数据后 启动所述定时器 T_WAIT;还用于在定时器超时之前收到节点 B的 E-AGCH 授权信息时复位并停止该定时器， 以及在所述定时器 T— WAIT超时后， 复 位并停止所述定时器 T— WAIT, 然后发起 E-RUCCH的随机接入过程。
所述 UE发起 E-RUCCH的随机接入过程是指： UE按照周期性定时器 T—RUCCH周期性触发 E-RUCCH,每触发一次就将计数器的值加 1 ,直到触 发次数一一即计数器的值超过最大尝试次数或直到接收到节点 B 的授权。 当然实际应用中， 也可以不对触发次数进行计数， 一直周期性触发 E-RUCCH, 直到获得授权。 计数器为一种具体实现方式， 也可以用其它方 式， 只要能实现对触发次数的记录即可。
本发明可以根据网络侧对 E-DCH资源的掌控能力， 控制 UE在一次授 权后发起随机接入的时延，避免无效的随机接入，使系统资源能得到合理利 用； 同时考虑到随机接入的沖突性， 提供了随机接入的可靠性传输方法。
当然， 本发明还可有其他多种实施例， 在不背离本发明精神及其实质的 形， 但这些相应的改变和变形都应属于本发明所附的权利要求的保护范围。 工业实用性
本发明可以根据网络侧对 E-DCH资源的掌控能力， 控制 UE在一次授 权后发起增强上行链路随机接入的时延，避免无效的随机接入，节省了资源； 同时提供了增强上行链路随机接入的可靠性机制。本方法使系统资源能得到 合理利用， 并大大提高系统工作效率。

Claims

权 利 要 求 书
1、 时分同步码分多址系统增强上行链路随机接入的控制方法， 其特征 在于， 包括：
在时分同步码分多址系统的高速上行分组接入调度业务中，网络侧高层 在用户终端侧配置定时器； 用户终端在一次授权适用时间到达后， 仍需传输 数据时， 启动所述定时器作为发起增强上行链路随机接入的延迟时间。
2、 如权利要求 1所述的时分同步码分多址系统增强上行链路随机接入 的控制方法， 其特征在于， 还包括：
如果在定时器超时前收到节点 B的授权信息则继续传输数据；否则在定 时器超时时进行增强上行链路随机接入上行控制信道的随机接入。
3、 如权利要求 2所述的时分同步码分多址系统增强上行链路随机接入 的控制方法， 其特征在于， 具体包括：
a、 网络侧为用户终端侧配置一个定时器；
b、 用户终端按照节点 B的授权信息发送新数据， 在绝对授权适用的最 后一个传输时间间隔的数据发出后， 用户终端启动所述定时器；
c、 若在所述定时器超时前， 用户终端收到了节点 B的授权信息， 则停 止并复位该定时器， 返回步骤 b; 在所述定时器超时之时， 发起增强上行链 路随机接入上行控制信道的随机接入， 向节点 B发送调度信息， 并复位和 停止所述定时器。
4、 如权利要求 3所述的时分同步码分多址系统增强上行链路随机接入 的控制方法， 其特征在于， 所述步骤（1 ) 中， 所述网络侧为服务无线网络 控制器或者节点8。
5、 如权利要求 4所述的时分同步码分多址系统增强上行链路随机接入 的控制方法， 其特征在于， 所述步骤 a中： 所述定时器值若由服务无线网络 控制器配置，服务无线网络控制器根据小区中增强上行链路的资源数和统计 用户数来设置所述定时器值。
6、 如权利要求 4所述的时分同步码分多址系统增强上行链路随机接入 的控制方法， 其特征在于， 所述步骤 a中： 所述定时器值若由节点 B配置， 且当增强上行物理信道的同步命令由 E-AGCH信道承载时， 所述定时器值 的上限为同步命令的最大间隔时间。
7、 如权利要求 4所述的时分同步码分多址系统增强上行链路随机接入 的控制方法， 其特征在于， 所述定时器值若由节点 B配置， 则节点 B通过 服务无线网络控制器将该定时器值转发给用户终端。
8、 如权利要求 3所述的时分同步码分多址系统增强上行链路随机接入 的控制方法， 其特征在于， 所述步骤 b中， 用户终端按照节点 B的授权信 息发送新数据时，若增强上行链路专用传输信道对应的逻辑信道緩沖区中仍 有数据需要发送， 则可以携带上辅助调度信息。
9、 如权利要求 3所述的时分同步码分多址系统增强上行链路随机接入 的控制方法， 其特征在于， 步骤 c中， 用户终端进行增强上行链路随机接入 上行控制信道的随机接入是指：周期性地触发增强上行链路随机接入上行控 制信道的随机接入直到接收到节点 B的授权。
10、 如权利要求 3 所述的时分同步码分多址系统增强上行链路随机接 入的控制方法， 其特征在于， 步骤 c中， 用户终端进行增强上行链路随机接 入上行控制信道的随机接入是指：周期性地触发增强上行链路随机接入上行 控制信道的随机接入，直到触发次数超过最大尝试次数或直到接收到节点 B 的授权。
11、 一种能够控制增强上行链路随机接入的时分同步码分多址系统，包 括用户终端、 节点 B 和服务无线网络控制器， 其特征在于： 所述用户终端 包括一定时器，所述用户终端用于在一次授权适用时间到达后仍需传输数据 时， 启动所述定时器； 还用于在定时器超时前收到节点 B 的授权信息时继 续传输数据；否则在定时器超时时进行增强上行链路随机接入上行控制信道 的随机接入。
12、 如权利要求 11所述的时分同步码分多址系统， 其特征在于： 所述 服务网络无线控制器用于根据小区中增强上行链路的资源数和统计用户数 设置所述定时器的值，并将该值包含在无线承载建立或者无线承载重配置命 令中发给用户终端； 所述用户终端用于按照该值配置所述定时器。
13、 如权利要求 11所述的时分同步码分多址系统， 其特征在于： 所述 节点 B 用于设置所述定时器的值并携带在反馈给服务网络无线控制器的响 应消息中；所述服务网络无线控制器用于在所述无线承载建立或者无线承载 重配置命令中转发该信息给用户终端；所述用户终端用于按照该值配置所述 定时器。
14、 如权利要求 11所述的时分同步码分多址系统， 其特征在于， 用户 终端进行增强上行链路随机接入上行控制信道的随机接入是指：用户终端周 期性地触发增强上行链路随机接入上行控制信道的随机接入直到接收到节 点 B的授权。
15、 如权利要求 11所述的时分同步码分多址系统， 其特征在于， 用户 终端进行增强上行链路随机接入上行控制信道的随机接入是指：用户终端周 期性地触发增强上行链路随机接入上行控制信道的随机接入，直到触发次数 超过最大尝试次数或直到接收到节点 B的授权。
PCT/CN2007/002463 2006-08-22 2007-08-15 Système td-scdma et procédé permettant de surveiller l'accès aléatoire à un hsupa Ceased WO2008025233A1 (fr)

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JP2009521096A JP4792525B2 (ja) 2006-08-22 2007-08-15 Ｔｄ−ｓｃｄｍａシステム及びそれにおけるｈｓｕｐａランダムアクセスの制御方法
KR20097005856A KR101091015B1 (ko) 2006-08-22 2007-08-15 Ｔｄ－ｓｃｄｍａ 시스템 및 그중 ｈｓｕｐａ 랜덤 접속의 제어방법
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