WO2012092795A1 - 一种触发多点协作传输的方法及系统 - Google Patents

一种触发多点协作传输的方法及系统 Download PDF

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Publication number
WO2012092795A1
WO2012092795A1 PCT/CN2011/081963 CN2011081963W WO2012092795A1 WO 2012092795 A1 WO2012092795 A1 WO 2012092795A1 CN 2011081963 W CN2011081963 W CN 2011081963W WO 2012092795 A1 WO2012092795 A1 WO 2012092795A1
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WIPO (PCT)
Prior art keywords
comp
retransmission
period
transmission
long
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PCT/CN2011/081963
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English (en)
French (fr)
Inventor
靳日飞
赵瑜
贺胜
樊荣
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中兴通讯股份有限公司
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Publication of WO2012092795A1 publication Critical patent/WO2012092795A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1825—Adaptation of specific ARQ protocol parameters according to transmission conditions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0689—Hybrid systems, i.e. switching and simultaneous transmission using different transmission schemes, at least one of them being a diversity transmission scheme

Definitions

  • the present invention relates to the field of mobile communication technologies, and in particular, to a method and system for triggering coordinated multipoint transmission. Background technique
  • the traditional CoMP (Coordinated Multi-Point) activation scheme is when the UE (User Equipment) moves to the cell edge and the downlink signal strength measured by the UE meets certain thresholds, the serving cell (hereinafter also The primary cell is configured as a CoMP type UE. Thereafter, the service of the UE is transmitted by using the CoMP scheme, and the serving cell and the coordinated cell transmit data through the X2 port.
  • UE User Equipment
  • the serving cell hereinafter also The primary cell is configured as a CoMP type UE.
  • the joint transmission (JT) scheme is an effective implementation scheme.
  • multiple transmission points serve one user at the same time, aiming at improving the quality of the received signal of the CoMP user and obtaining the diversity gain.
  • the implementation of the traditional CoMP solution will result in a decrease in resource utilization and an increase in the burden of the X2 port. Summary of the invention
  • the technical problem to be solved by the present invention is to provide a method and system for triggering coordinated multi-point transmission, which can adaptively adjust the transmission scheme of the CoMP UE and reduce the occupation of radio resources and X2 port resources.
  • the present invention provides a method for triggering multipoint coordinated transmission, which includes:
  • the retransmission ratio means that a hybrid automatic repeat request (HARQ ) occurs within one statistical period.
  • the step of determining whether the service transmission of the UE uses the CoMP mode according to whether the proportion of the retransmission according to the statistics exceeds a predetermined trigger threshold includes:
  • the retransmission ratio does not exceed the predetermined trigger threshold, it is determined that the UE's service transmission is not transmitted using the CoMP mode at least during the new transmission.
  • the above method may further include:
  • the serving cell configures the UE as a CoMP type UE
  • the state of the UE is defaulted or configured to be a long CoMP deactivated state or a long CoMP activated state
  • the new transmission of the service transmission is not transmitted by using the CoMP method, and the retransmission is transmitted by using the CoMP method; or, the new transmission and the retransmission are not transmitted by using the CoMP method;
  • both the new transmission and the retransmission of the service transmission are transmitted by using the CoMP method.
  • the step of determining whether the service transmission of the UE uses the CoMP mode according to whether the proportion of the retransmission according to the statistics exceeds a predetermined trigger threshold includes:
  • the retransmission ratio in the period is counted at the end of each first period, and if the retransmission ratio in the period is higher than the first trigger threshold, The state of the UE is switched to a long CoMP activation state; if the retransmission ratio in the period is less than or equal to the first trigger threshold, the state of the UE is maintained to be deactivated for a long CoMP in the next first period. status.
  • the step of determining whether the service transmission of the UE is transmitted by using the CoMP mode according to whether the retransmission ratio according to the statistics exceeds a predetermined trigger threshold further includes:
  • the UE When the UE is in the long CoMP activation state, statistics are collected at the end of each second period. If the retransmission ratio in the period is lower than the second trigger threshold, the state of the UE is switched to the long CoMP deactivation state; if the retransmission ratio in the period is counted Above or equal to the second trigger threshold, the state of the UE is maintained to be a long CoMP active state for the next second period.
  • the first period and the second period are determined by the number of subframes or the number of scheduling, and the first period and the second period are equal or unequal.
  • the above method can also have the following characteristics:
  • the retransmission ratio includes a ratio of the number of times the error acknowledgement (NACK) feedback is received to the total number of transmissions;
  • the retransmission ratio includes the ratio of the number of times the cyclic redundancy check (CRC) error is detected to the total number of transmissions.
  • CRC cyclic redundancy check
  • the above method may further include:
  • the physical downlink control channel (PDCCH) for the physical downlink shared channel (PDSCH) resource allocation indication is included in the activation indication information, indicating whether the current transmission uses the CoMP mode.
  • the present invention also provides a system for triggering multipoint coordinated transmission based on retransmission, comprising: a statistics module, configured to: a retransmission ratio when a coordinated multipoint coordinated (CoMP) type user equipment (UE) is transmitted;
  • a statistics module configured to: a retransmission ratio when a coordinated multipoint coordinated (CoMP) type user equipment (UE) is transmitted;
  • CoMP coordinated multipoint coordinated
  • the switching triggering module is configured to: determine whether the service transmission of the UE is transmitted by using the CoMP mode according to whether the retransmission ratio calculated by the statistics module exceeds a predetermined triggering threshold.
  • the retransmission ratio calculated by the statistics module refers to the ratio of the number of HARQ retransmissions to the total number of transmissions in one statistical period
  • the handover triggering module is configured to: if the retransmission ratio exceeds a predetermined trigger threshold, determine that the service transmission of the UE is transmitted by using CoMP mode; if the retransmission ratio does not exceed a predetermined trigger threshold, determine The service transmission of the UE does not use the CoMP method at least in the new transmission. Transmission.
  • the above system may also include an initial configuration module,
  • the initial configuration module is configured to: default or configure the CoMP type UE to be in a long CoMP deactivated state or a long CoMP activated state;
  • the new transmission of the service transmission is not transmitted by using the CoMP method, and the retransmission is transmitted by using the CoMP method; or, the new transmission and the retransmission are not transmitted by using the CoMP method;
  • both the new transmission and the retransmission of the service transmission are transmitted by using the CoMP method.
  • the statistics module is configured to calculate a retransmission ratio in the following manner: when the UE is in the long CoMP deactivation state, the retransmission ratio in the period is counted at the end of each first period; The module is configured to: if the retransmission ratio in the current period is higher than the first trigger threshold, the state of the UE is switched to a long CoMP activation state; if the statistics module is in the current period If the retransmission ratio is lower than or equal to the first trigger threshold, the state of the UE is maintained to be a long CoMP deactivation state in the next first period.
  • the statistics module is configured to further calculate a retransmission ratio in the following manner: when the UE is in the long CoMP activation state, the retransmission ratio in the period is counted at the end of each second period;
  • the triggering module is configured to: if the retransmission ratio in the current period is lower than the second triggering threshold, the state of the UE is switched to a long CoMP deactivation state; if the statistical module counts the weight in the current period If the transmission ratio is higher than or equal to the first trigger threshold, the state of the UE is maintained as a long CoMP activation state in the next second period;
  • the first period and the second period are determined by the number of subframes or the number of scheduling times, and the first period and the second period are equal or unequal.
  • the statistics module is configured to: for the transmitted uplink data, the statistics of the retransmission ratio package The ratio of the number of times the NACK feedback is received to the total number of transmissions; for the downlink data transmitted, the proportion of the retransmission statistics includes the ratio of the number of times the CRC error is detected to the total number of transmissions.
  • the handover triggering module is further configured to: in the UE service transmission, include, in the PDCCH for the PDSCH resource allocation indication, activation indication information, indicating whether the current transmission uses the CoMP mode.
  • the above-mentioned CoMP-based mechanism for re-transmitting when the UE moves to the cell edge, the UE measures the RSRP (Reference Signal Receiving Power) of the local cell gradually becomes smaller, and the interference of the neighboring area becomes more and more.
  • RSRP Reference Signal Receiving Power
  • eNodeB Evolved Node B triggers whether the UE performs CoMP transmission according to the RSRP of the local area measured by the UE and the RSRP of the neighboring cell and then refers to the given threshold.
  • some services of some UEs may perform unnecessary CoMP transmission.
  • FIG. 1 is a schematic diagram of a downlink PDCCH (Physical Downlink Control Channel) format used for resource allocation indication of a PDSCH (Physical Downlink Shared Channel) according to an embodiment of the present invention
  • FIG. 2 is a flow chart of a decision of a long CoMP activation/deactivation according to an embodiment of the present invention
  • FIG. 5 is a flowchart of a same period same threshold retransmission activated CoMP according to an embodiment of the present invention.
  • the method of the embodiment of the present invention includes: determining, by the CoMP type UE, whether the service transmission of the UE is transmitted by using the CoMP mode according to whether the retransmission ratio of the traffic transmission statistics exceeds a predetermined trigger threshold.
  • the eNodeB does not use the CoMP transmission when scheduling the first packet to be newly transmitted (that is, the CoMP JT policy is used for the downlink, and the multiple eNodeB is used for the uplink.
  • Receiving a policy but using a single cell (preferably a primary cell) to transmit traffic for the UE; according to the ACK/NACK (Acknowledgement/Negative Acknowledgement) feedback information of the UE or the serving cell detection CRC (Cyclic Redundancy Check) , Cyclic Redundancy Check)
  • CRC Cyclic Redundancy Check
  • the eNodeB schedules the next packet new transmission, and still does not use CoMP transmission; and if the eNodeB receives the UE Feedback NACK (for downlink transmission) or serving cell detection CRC error (for uplink traffic), then use CoMP transmission when retransmission; and can use activation indication information (such as flag bit) related to CoMP transmission in PDCCH, as shown in Figure 1. As shown, the UE is notified whether the transmission is transmitted using CoMP.
  • the retransmission ratio calculated according to the UE service transmission may be determined, for example, the ratio of the number of times the NACK feedback is received to the total number of transmissions in a period of time, or the ratio of the number of times the CRC error is detected to the total number of transmissions is determined. Activate or deactivate the CoMP transmission method.
  • the HARQ adaptive transmission of the first transmission also uses CoMP (for the downlink using the CoMP JT strategy, for the uplink using multiple eNodeB joint reception strategies). This scheduling can reduce the pressure on the network from unnecessary CoMP transmissions.
  • the content of the PDCCH sent by the eNodeB is changed only when the CoMP transmission is used, and the signaling overhead is not increased.
  • Long CoMP deactivation state When the scheduled UE enters this state, the new transmission is not transmitted by CoMP, and the retransmission is transmitted by CoMP; or, the new transmission and the retransmission are not transmitted by CoMP.
  • Long CoMP statistics period Specifically, the length of time that the eNodeB enters long CoMP activation or long CoMP deactivation (can be measured by the number of subframes or the number of scheduling).
  • the handover period includes two periods, one is long.
  • the statistical period in the CoMP activation state one is the statistical period in the long CoMP deactivation state;
  • Retransmission ratio the number of retransmissions / the total number of transmissions
  • Trigger Threshold It can be divided into the first trigger threshold in the long CoMP deactivation state (ie, the long CoMP activation trigger threshold) and the second trigger threshold in the long CoMP activation state (ie, the long CoMP deactivation trigger threshold).
  • FIG. 2 is a flowchart showing an implementation process of a long CoMP activation deactivation state determination scheme according to an embodiment of the present invention. As shown in FIG. 2, the process mainly includes the following steps:
  • Step 201 The UE moves to the CoMP area, and the eNodeB configures the UE to be a CoMP type UE.
  • the state when the UE uplink and downlink service transmission is first organized is a long CoMP deactivation state, that is, the new transmission does not use the CoMP mode, when the HARQ weight occurs.
  • the CoMP mode is triggered when transmitting; Step 202.
  • the eNodeB counts the retransmission ratio in the switching cycle time in the CoMP deactivated state;
  • Step 203 If the retransmission ratio is higher than the set long CoMP activation trigger threshold, step 204 is performed; if not, step 205 is performed;
  • Step 204 The eNodeB changes the UE state to the long CoMP activation state, and performs step 206; Step 205.
  • the UE is placed in the long CoMP deactivation state to organize the transmission, and then returns to step 202; Step 206.
  • the eNodeB organizes the uplink and downlink service transmissions of the UE to use the CoMP mode, and does not distinguish between retransmission and new transmission, and the eNodeB still counts the retransmission ratio in the long CoMP activation period;
  • Step 207 If the retransmission ratio is less than the set long CoMP deactivation trigger threshold, the eNodeB sets the UE to a long CoMP deactivation state, and performs step 205; if greater than or equal to, the long CoMP activation state is still used for service transmission, that is, Go back to step 204.
  • FIG. 3 is a flowchart showing the operation of the eNodeB to the UE when the state of the UE is deactivated by the CoMP in the embodiment of the present invention. As shown in FIG. 3, the specific steps of the process are as follows:
  • Step 301 When the HARQ is transmitted, the eNodeB determines whether it is the first transmission of the HARQ, that is, whether it is a new transmission or a retransmission, if the new transmission is performed in step 302, if it is a retransmission, then the process proceeds to step 303;
  • step 302 the transmission does not use CoMP transmission, that is, the bit associated with the CoMP transmission in the PDCCH is reset (written as 0) corresponding to the downlink transmission, and the coordinated cell is not notified to perform CoMP reception when the uplink transmission is performed, and step 305 is performed;
  • Step 303 The CoMP transmission is used for the transmission, that is, the corresponding flag position bit related to the CoMP transmission in the PDCCH for downlink transmission (for example, the corresponding bit bit is written as 1), and the coordinated cell is notified to perform CoMP reception when the uplink transmission is performed. And pass the data to the service cell through the X2 port;
  • Step 304 when the retransmission occurs, the value of the statistical variable M of the number of retransmissions is incremented by 1, and then step 305 is performed;
  • Step 305 the eNodeB receives the ACK/NACK (for downlink transmission) fed back by the UE or parses the CRC of the uplink data (for uplink transmission), and adds 1 to the value of the number N of transmissions of the UE;
  • Step 306 determines whether the value of N satisfies the length The cycle condition of the CoMP deactivation, if the period condition is not met, step 307 is performed, the new transmission or retransmission is continued, and then the process proceeds to step 1. If the period condition is met, step 310 is performed;
  • Step 307 it is determined that the ACK is fed back by the UE or the CRC fed back by the UE is correct, and step 308 is performed to determine that the UE is fed back with a NACK or the CRC fed back by the UE is incorrect, and step 309 is performed;
  • Step 308 continue to organize new transmission, and then return to step 301;
  • Step 309 continue to organize the retransmission, and then return to step 301;
  • Step 310 Determine the relationship between the M/N and the first threshold (for example, the system configurable threshold is set to 2, etc.). If M/N> the first threshold, the number of retransmissions is too large. The channel condition of the time needs to perform CoMP transmission to reduce the signaling overhead and delay caused by the retransmission, and step 311 is performed; if the M/N first threshold is performed, step 312 is performed;
  • the first threshold for example, the system configurable threshold is set to 2, etc.
  • Step 311 using long CoMP activation mode for transmission, and ending.
  • Step 312 still using the current long CoMP deactivation mode for transmission, and performing steps
  • the service transmission mode of the UE in the long CoMP deactivation state, is: the new transmission does not use the CoMP transmission, and the retransmission uses the CoMP transmission.
  • SPS Semi-Persistent Scheduling
  • Transmission Transmission Time Interval
  • Services such as voice over Internet Protocol (VoIP) have high anti-interference characteristics.
  • VoIP voice over Internet Protocol
  • the UE's service transmission can also be retransmission and new transmission. Using CoMP mode, you can further save X2 port resources and network resources.
  • the operation flow of the eNodeB to the UE is as shown in FIG. 4, and the eNodeB uses the CoMP for the service of the UE regardless of the new transmission, and uses the CoMP method and the long CoMP to deactivate.
  • the method of using CoMP is similar, the specific steps are as follows:
  • Step 401 the eNodeB determines whether the HARQ is the first transmission, if it is a retransmission, the process proceeds to step 402, and if it is the first transmission, the process proceeds to step 403;
  • Step 402 If it is determined to be retransmitted, the M value of the statistical retransmission accumulation number is increased by 1;
  • Step 403 using CoMP for uplink and downlink transmission, as described in step 3 of the foregoing embodiment; Step 404, counting the number of times the UE transmits N;
  • Step 405 it is determined whether N meets the periodic condition, if yes, step 406 is performed, otherwise step 409 is performed;
  • Step 406 Determine that the UE feeds back an ACK or the CRC fed back by the UE is correct, and the step of performing 407, judging that the UE is fed back by the NACK or the CRC of the UE feedback is incorrect, step 408 is performed; step 407, continuing to organize the new transmission, and then returning to step 401;
  • Step 408 continue to organize the retransmission, and then return to step 401;
  • Step 409 determine the relationship between ⁇ / ⁇ and the second threshold (such as the threshold value of 4), if ⁇ / ⁇ > second threshold to perform step 410; ⁇ / ⁇ second threshold execution step 411;
  • Step 410 ⁇ / ⁇ > second threshold, continue to use the long CoMP activation mode for transmission, and proceeds to step 406;
  • step 411 the M/N second threshold is transmitted using the long CoMP deactivation mode, and the long CoMP deactivation process is entered.
  • the long CoMP activation switching period and the long CoMP deactivation switching period can be considered as the same period.
  • the retransmission ratio judgment threshold of the long CoMP activation and deactivation is a value, which can simplify the implementation. Process. As shown in Figure 5, the specific process is described as follows:
  • Step 501 the eNodeB determines whether the HARQ is transmitted for the first time and the long CoMP transmission is not activated. If the step 502 is performed, if not step 503 is performed;
  • Step 502 Perform the uplink and downlink service transmission without using the CoMP transmission mode, and perform step 506.
  • Step 503 Perform the uplink and downlink service transmission by using the CoMP mode, that is, the bit position related to the CoMP transmission in the PDCCH for the downlink transmission (for example, 1), corresponding to the uplink transmission, notify the coordinated cell to perform CoMP reception and transmit the data to the serving cell through the X2 port, and then perform step 504;
  • the CoMP mode that is, the bit position related to the CoMP transmission in the PDCCH for the downlink transmission (for example, 1), corresponding to the uplink transmission, notify the coordinated cell to perform CoMP reception and transmit the data to the serving cell through the X2 port, and then perform step 504;
  • Step 504 it is determined whether the packet data is a retransmission or a new transmission, if it is a retransmission execution step 505, if it is a new transmission, step 506 is performed;
  • Step 505 the variable retransmission variable M is incremented by 1, and then step 506 is performed;
  • Step 506 adding 1 to the value of the count N of counting the number of UE service transmissions;
  • Step 507 it is determined whether N meets the CoMP handover statistics period, if N satisfies the condition, that is, N>CoMP handover statistics period, step 508 is performed, if N does not satisfy the condition, step 7 is performed; Step 508, determining the M/N value and the retransmission ratio threshold value comparison, when M / N is greater than the threshold value, step 509 is performed, M / N is less than or equal to the threshold value, then step 510 is performed;
  • Step 509 the UE is set to a long CoMP active transmission mode, and step 511 is performed;
  • Step 510 The UE is set to a long CoMP deactivation transmission mode, and step 511 is performed.
  • Step 511 The eNodeB organizes a new transmission or a retransmission according to the ACK/NACK fed back by the UE or the CRC information of the uplink service, and then returns to step 501.
  • a system for triggering multi-point coordinated transmission based on retransmission is further provided, where the system mainly includes:
  • the statistic module is configured to count the retransmission ratio of the CoMP type UE service transmission; the handover triggering module is configured to determine whether the service transmission of the UE uses CoMP according to whether the retransmission ratio calculated by the statistic module exceeds a predetermined trigger threshold. Mode transfer.
  • the retransmission ratio calculated by the statistics module refers to the ratio of the number of HARQ retransmissions to the total number of transmissions in one statistical period
  • the switching triggering module is configured to: if the retransmission ratio exceeds a predetermined triggering threshold, determine that the service transmission of the UE is transmitted by using CoMP mode; if the retransmission ratio does not exceed a predetermined triggering threshold, determine the The UE's service transmission is not transmitted using CoMP mode at least when it is newly transmitted.
  • the system may further include an initial configuration module.
  • the initial configuration module is configured to default or configure the state of the CoMP type UE to be a long CoMP deactivated state or a long CoMP activated state;
  • the new transmission of the service transmission is not transmitted by using the CoMP method, and the retransmission is transmitted by using the CoMP method; or, the new transmission and the retransmission are not transmitted by using the CoMP method;
  • both the new transmission and the retransmission of the service transmission are transmitted by using the CoMP method.
  • the statistics module is configured to: the UE is in the long CoMP deactivation state. At the end of each first cycle, the proportion of retransmissions in the cycle is counted;
  • the handover triggering module is configured to switch the state of the UE to a long CoMP activation state if the retransmission ratio in the current period is lower than the first trigger threshold; otherwise, the state of the UE The long CoMP deactivation state is still in the next first cycle.
  • the statistic module is configured to: when the UE is in the long CoMP activation state, calculate a retransmission ratio in the period at the end of each second period;
  • the handover triggering module is configured to switch the state of the UE to a long CoMP deactivation state if the retransmission ratio in the current period is lower than the second trigger threshold; otherwise, the state of the UE is in the next The long CoMP activation state is still in the second cycle;
  • the first period and the second period are determined by the number of subframes or the number of scheduling times, and the first period and the second period are equal or unequal.
  • the statistics module is configured to: for the transmitted uplink data, the statistics of the retransmission ratio includes a ratio of the number of times the NACK feedback is received to the total number of transmissions; and for the downlink data to be transmitted, the retransmission of the statistics The ratio includes the ratio of the number of times a CRC error is detected to the total number of transmissions.
  • the handover triggering module is configured to: in the UE service transmission, include, in the PDCCH for the PDSCH resource allocation indication, activation indication information, indicating whether the current transmission uses the CoMP mode.
  • modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. Perform the steps shown or described, or separate them into individual integrated circuit modules, or make multiple modules or steps in them Implemented as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.
  • the present invention proposes a mechanism for activating CoMP based on retransmission.
  • the UE measures the RSRP (Reference Signal Receiving Power) of the local cell gradually becomes smaller, and the interference of the neighboring area becomes more and more.
  • RSRP Reference Signal Receiving Power
  • eNodeB Evolved Node B
  • some services of some UEs may perform unnecessary CoMP transmission.
  • the use of the retransmission-activated CoMP mechanism proposed by the present invention can avoid this situation, and enable the system to adaptively switch the CoMP transmission function according to the actual condition of the wireless channel, thereby reducing the use of unnecessary CoMP transmission. Overhead, increase the capacity of the network.

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Abstract

本发明公开了一种触发多点协作传输的方法及系统，在进行CoMP类型UE的业务传输时，根据统计的重传比例是否超出预定的触发门限，确定UE的业务传输是否使用CoMP方式传输。采用本发明，系统可根据无线信道的实际状况进行自适应的激活或去激活CoMP传输，降低由于使用不必要的CoMP传输所带来的开销，提高网络的容量。

Description

一种触发多点协作传输的方法及系统
技术领域
本发明涉及移动通信技术领域， 更具体地， 涉及一种触发多点协作传输 的方法及系统。 背景技术
传统的 CoMP ( Coordinated Multi-Point, 多点协作）激活方案是， 当 UE ( User Equipment, 用户设备 )往小区边缘移动， UE测量的下行信号强度值 满足某种门限的时候， 服务小区 （以下也称作主小区）将 UE配置为 CoMP 类型的 UE。 此后， 该 UE的业务就会釆用 CoMP方案进行传输， 服务小区和 协作小区通过 X2口进行数据传输。
联合传输（ Joint Transmission, 简称为 JT )方案是一种有效的实现方案， 该方案中， 多个传输点同时为一个用户服务， 旨在提高 CoMP用户接收信号 的质量， 获得分集增益。 但是， 由于 CoMP的用户占用了多个小区的资源， 因此，传统 CoMP方案在实现时会导致资源利用率的下降， 同时也会增加 X2 口的负担。 发明内容
本发明解决的技术问题是提供一种触发多点协作传输的方法及系统， 能 够自适应调节 CoMP UE的传输方案， 降低对无线资源和 X2口资源的占用。
为解决上述技术问题， 本发明提供了一种触发多点协作传输的方法， 其 包括：
在进行多点协作 （CoMP )类型用户设备 ( UE ) 的业务传输时， 根据统 计的重传比例是否超出预定的触发门限， 确定所述 UE的业务传输是否使用 CoMP方式传输。
上述方法还可具有以下特点：
所述重传比例是指，在一个统计周期内，发生混合自动重传请求（ HARQ ) 重传的次数与传输总次数的比值；
所述根据统计的重传比例是否超出预定的触发门限， 确定所述 UE的业 务传输是否使用 CoMP方式传输的步骤包括：
若所述重传比例超出预定的触发门限， 则确定所述 UE的业务传输使用 CoMP方式传输；
若所述重传比例没有超出预定的触发门限， 则确定所述 UE的业务传输 至少在新传时不使用 CoMP方式传输。
上述方法还可包括：
服务小区将 UE配置为 CoMP类型 UE时，默认或配置所述 UE的状态为 长 CoMP去激活状态或长 CoMP激活状态；
其中， 所述 UE处于所述长 CoMP去激活状态下时， 业务传输的新传不 使用 CoMP方式传输， 重传使用 CoMP方式传输； 或者， 新传和重传均不使 用 CoMP方式传输；
所述 UE处于所述长 CoMP激活状态下时， 业务传输的新传和重传均使 用 CoMP方式传输。
上述方法还可具有以下特点：
所述根据统计的重传比例是否超出预定的触发门限， 确定所述 UE的业 务传输是否使用 CoMP方式传输的步骤包括：
所述 UE处于所述长 CoMP去激活状态下时， 在每个第一周期结束时统 计该周期内的重传比例， 若统计的该周期内的重传比例高于第一触发门限， 则将所述 UE的状态切换为长 CoMP激活状态； 若统计的该周期内的重传比 例低于或等于第一触发门限， 则保持所述 UE的状态在下个第一周期内仍为 长 CoMP去激活状态。
上述方法还可具有以下特点：
所述根据统计的重传比例是否超出预定的触发门限， 确定所述 UE的业 务传输是否使用 CoMP方式传输的步骤还包括：
所述 UE处于所述长 CoMP激活状态下时， 在每个第二周期结束时统计 该周期内的重传比例， 若统计的该周期内的重传比例低于第二触发门限， 则 将所述 UE的状态切换为长 CoMP去激活状态； 若统计的该周期内的重传比 例高于或等于第二触发门限， 则保持所述 UE的状态在下个第二周期内仍为 长 CoMP激活状态。
上述方法还可具有以下特点：
所述第一周期和第二周期通过子帧数或调度次数确定， 且所述第一周期 和第二周期相等或不相等。 上述方法还可具有以下特点：
对于传输的上行数据， 所述重传比例包括收到错误应答（NACK )反馈 的次数占传输总次数的比例；
对于传输的下行数据， 所述重传比例包括检测到循环冗余校验 ( CRC ) 错误的次数占传输总次数的比例。
上述方法还可包括：
在所述 UE业务传输中， 在用于物理下行共享信道（PDSCH ) 资源分配 指示的物理下行控制信道（PDCCH ) 中包含激活指示信息， 指示本次传输是 否使用 CoMP方式。
本发明还提供一种基于重传触发多点协作传输的系统， 其包括： 统计模块， 其设置为： 统计多点协作 （CoMP )类型用户设备（UE )业 务传输时的重传比例； 以及
切换触发模块， 其设置为： 根据所述统计模块统计的重传比例是否超出 预定的触发门限， 确定所述 UE的业务传输是否使用 CoMP方式传输。
上述系统还可具有以下特点：
所述统计模块统计的重传比例是指， 在一个统计周期内， 发生 HARQ重 传的次数与传输总次数的比值；
所述切换触发模块是设置为： 若所述重传比例超出预定的触发门限， 则 确定所述 UE的业务传输使用 CoMP方式传输； 若所述重传比例没有超出预 定的触发门限， 则确定所述 UE的业务传输至少在新传时不使用 CoMP方式 传输。
上述系统还可包括初始配置模块，
所述初始配置模块设置为： 默认或配置所述 CoMP类型 UE的状态为长 CoMP去激活状态或长 CoMP激活状态；
其中， 所述 UE处于所述长 CoMP去激活状态下时， 业务传输的新传不 使用 CoMP方式传输， 重传使用 CoMP方式传输； 或者， 新传和重传均不使 用 CoMP方式传输；
所述 UE处于所述长 CoMP激活状态下时， 业务传输的新传和重传均使 用 CoMP方式传输。
上述系统还可具有以下特点：
所述统计模块是设置为以如下方式统计重传比例： 所述 UE处于所述长 CoMP去激活状态下时， 在每个第一周期结束时统计该周期内的重传比例； 所述切换触发模块是设置为： 若所述统计模块统计的本周期内的重传比 例高于第一触发门限， 则将所述 UE的状态切换为长 CoMP激活状态； 若所 述统计模块统计的本周期内的重传比例低于或等于第一触发门限， 则保持所 述 UE的状态在下个第一周期内仍为长 CoMP去激活状态。
上述系统还可具有以下特点：
所述统计模块是设置为还以如下方式统计重传比例： ： 所述 UE处于所 述长 CoMP激活状态下时，在每个第二周期结束时统计该周期内的重传比例； 所述切换触发模块是设置为： 若统计的本周期内的重传比例低于第二触 发门限， 则将所述 UE的状态切换为长 CoMP去激活状态； 若所述统计模块 统计的本周期内的重传比例高于或等于第一触发门限， 则保持所述 UE的状 态在下个第二周期内仍为长 CoMP激活状态；
其中， 所述第一周期和第二周期通过子帧数或调度次数确定， 且所述第 一周期和第二周期相等或不相等。
上述系统还可具有以下特点：
所述统计模块是设置为： 对于传输的上行数据， 统计的所述重传比例包 括收到 NACK反馈的次数占传输总次数的比例； 对于传输的下行数据， 统计 的所述重传比例包括检测到 CRC错误的次数占传输总次数的比例。
上述系统还可具有以下特点：
所述切换触发模块还设置为： 在所述 UE业务传输中， 在用于 PDSCH资 源分配指示的 PDCCH中包含激活指示信息， 指示本次传输是否使用 CoMP 方式。
综上所述， 上述基于重传激活 CoMP的机制， 当 UE往小区边缘移动时， UE测量本小区的 RSRP ( Reference Signal Receiving Power, 参考信号接收功 率）逐渐变小， 邻区的干扰越来越大， eNodeB (演进的节点 B )根据 UE测 量的本区的 RSRP和邻区的 RSRP然后参照给定的门限来触发 UE是否进行 CoMP传输。这种情况下， 由于无线信道的复杂多变性以及 UE测量的准确性 等因素影响， 存在某些 UE的某些业务会进行不必要的 CoMP传输。 使用本 发明提出的基于重传激活的 CoMP机制可以避免这种情况的发生， 使得系统 根据无线信道的实际状况进行自适应的开关 CoMP传输的功能， 降低由于使 用不必要的 CoMP传输所带来的开销， 提高网路的容量。 附图概述
此处所说明的附图用来提供对本发明的进一步理解， 构成本申请的一部 分， 本发明的示意性实施例及其说明用于解释本发明， 并不构成对本发明的 不当限定。 在附图中：
图 1为本发明实施例的用于 PDSCH (物理下行共享信道 )的资源分配指 示的下行 PDCCH (物理下行控制信道）格式示意图；
图 2为本发明实施例的长 CoMP激活 /去激活的判决流程图；
图 3为本发明实施例的长 CoMP去激活流程图；
图 4为本发明实施例的长 CoMP激活流程图；
图 5为本发明实施例的同周期同门限重传激活 CoMP流程图。 本发明的较佳实施方式 下文中将结合附图对本发明的实施例进行详细说明。 需要说明的是， 在 不冲突的情况下， 本申请中的实施例及实施例中的特征可以相互任意组合。
本发明的实施方式的方法包括：对于 CoMP类型 UE,根据业务传输时统 计的重传比例是否超出预定的触发门限，确定 UE的业务传输是否使用 CoMP 方式传输。
具体地， 对于处于长 CoMP去激活状态的 UE, UE在进行业务传输时， eNodeB 调度首个包新传的时候不使用 CoMP 方式传输（即对于下行使用 CoMP JT策略， 对于上行使用多个 eNodeB联合接收策略） ， 而是使用单小 区 （优选为主小区 ） 为该 UE 传输业务； 根据 UE 的 ACK/NACK ( Acknowledgement/Negative Acknowledgement , 正确 /错误应答消息 )反馈信 息或服务小区检测 CRC ( Cyclic Redundancy Check, 循环冗余校验）结果， 决定重传或下一次新传是否使用 CoMP方式传输。
例如，若第一包新传 UE反馈 ACK(对于下行传输）或服务小区检测 CRC 正确 （对于上行业务） ， 则 eNodeB调度下一包新传， 仍然不使用 CoMP方 式传输； 而若 eNodeB收到 UE反馈 NACK (对于下行传输）或服务小区检测 CRC错误（对于上行业务），则重传的时候使用 CoMP传输；并可利用 PDCCH 中与 CoMP传输相关的激活指示信息 （如标志位） ， 如图 1所示， 通知 UE 本次传输是否使用 CoMP方式传输。
优选的， 还可根据 UE业务传输时统计的重传比例， 如一段时间内收到 NACK反馈的次数占传输总次数的比例，或者检测到 CRC错误的次数占传输 总次数的比例来决定是否要激活或者去激活 CoMP传输方式。
假设每次第一包新传收到 NACK (对于下行传输 )或服务小区检测 CRC 错误（对于上行业务）从而触发 HARQ ( Hybrid Automatic Repeat Request, 混合自动重传请求）重传的概率较大， 则 HARQ自适应的将第一次传输也使 用 CoMP (对于下行使用 CoMP JT策略， 对于上行使用多个 eNodeB联合接 收策略）方式传输。这样调度可以降低不必要的 CoMP传输带给网络的压力。 且每次是否使用 CoMP传输只需要 eNodeB下发的 PDCCH中内容作变化就可 以， 不会增加信令开销。 为便于描述， 首先对本发明的具体实施中涉及的如下概念进行介绍：
1.长 CoMP激活状态： 当调度的 UE进入这种状态的时候， 新传重传都 釆用 CoMP方式传输。
2.长 CoMP去激活状态： 当调度的 UE进入这种状态的时候， 新传不釆 用 CoMP方式传输， 重传使用 CoMP方式传输； 或者， 新传和重传都不釆用 CoMP方式传输。
3.长 CoMP统计周期： 具体是指 eNodeB进入长 CoMP激活或长 CoMP 去激活持续的时间长度（可以用子帧数量或调度的次数来计量） ， 切换周期 包括两种周期，一种是在长 CoMP激活状态下的统计周期，一种是在长 CoMP 去激活状态下的统计周期；
4.重传比例： 在一个统计周期内， 重传比例=重传发生的次数 /传输的总 次数；
5. 触发门限： 具体可分为长 CoMP去激活状态下的第一触发门限（即长 CoMP激活触发门限 ) ,和长 CoMP激活状态下的第二触发门限（即长 CoMP 去激活触发门限） 。
图 2示出了本发明实施例的长 CoMP激活去激活状态判断方案的实施流 程， 如图 2所示， 该流程主要包括如下步骤：
步骤 201. UE移动到 CoMP区域， eNodeB配置 UE为 CoMP类型 UE; 第一次组织 UE上下行业务传输的时候的状态为长 CoMP去激活状态， 也就 是新传不使用 CoMP模式， 当发生 HARQ重传的时候触发使用 CoMP模式； 步骤 202. eNodeB统计长 CoMP去激活状态下的切换周期时间内的重传 比例；
步骤 203.若重传比例高于设定的长 CoMP激活触发门限， 则执行步骤 204; 若不高于， 则执行步骤 205;
步骤 204.eNodeB将该 UE状态转为长 CoMP激活状态， 执行步骤 206; 步骤 205.将 UE置于长 CoMP去激活状态组织传输， 然后返回步骤 202; 步骤 206.当 UE状态为长 CoMP激活状态时， eNodeB组织 UE上下行业 务传输都是用 CoMP模式， 不区分重传和新传， eNodeB依然统计长 CoMP 激活周期内重传比例；
步骤 207.若重传比例小于设定的长 CoMP去激活触发门限， 则 eNodeB 将 UE置为长 CoMP去激活状态， 执行步骤 205; 若大于或等于，依然使用长 CoMP激活状态进行业务传输， 即返回步骤 204。
图 3示出了本发明实施例中，当 UE的状态为长 CoMP去激活下， eNodeB 对 UE的操作流程， 如图 3所示， 该流程具体步骤描述如下：
步骤 301 , HARQ传输的时候， eNodeB判断是否为 HARQ第一次传输， 即判断是新传还是重传， 若是新传执行步骤 302, 若是重传则跳到步骤 303;
步骤 302, 此次传输不使用 CoMP传输， 即对应下行传输的时候 PDCCH 中与 CoMP传输相关的 bit位复位（写为 0 ) , 对应上行传输的时候不通知协 作小区进行 CoMP接收， 执行步骤 305;
步骤 303 , 此次传输使用 CoMP传输， 即对于下行传输的时候 PDCCH 中与 CoMP传输相关的对应标志位置位（例如将对应的 bit位写为 1 ) , 对应 上行传输的时候通知协作小区进行 CoMP接收并将数据通过 X2 口传给服务 小区；
步骤 304, 重传发生的时候， 将统计重传次数的统计变量 M的值加 1 , 然后执行步骤 305;
步骤 305, eNodeB接收 UE反馈的 ACK/NACK (对于下行传输 )或解析 上行数据的 CRC (对于上行传输 ) , 并将统计 UE传输次数 N的值加 1； 步骤 306, 判断 N的值是否满足长 CoMP去激活的周期条件， 若不满足 周期条件则执行步骤 307, 继续组织新传或重传然后跳到步骤 1 , 若满足周期 条件则执行步骤 310;
步骤 307 , 判断 UE反馈的是 ACK或者 UE反馈的 CRC正确， 执行步骤 308 , 判断 UE反馈的是 NACK或 UE反馈的 CRC不正确， 执行步骤 309;
步骤 308, 继续组织新传， 然后返回步骤 301 ; 步骤 309, 继续组织重传， 然后返回步骤 301 ;
步骤 310, 判断 M/N与第一门限值 (例如系统可配置设定门限值为 2, 等） 的关系， 若 M/N>第一门限， 则说明重传的次数太多， 这时候的信道条 件需要进行 CoMP传输来降低重传造成的信令开销和时延， 执行步骤 311 ; 若 M/N 第一门限则执行步骤 312;
步骤 311 , 使用长 CoMP激活模式进行传输， 结束。
步骤 312, 依然延用现在的长 CoMP去激活模式进行传输， 并执行步骤
307。
本实施例中， 在长 CoMP去激活状态下， UE的业务传输方式为： 新传不 使用 CoMP方式传输， 重传使用 CoMP方式传输。 需要说明的是， 在本发明 其他实施中， 对于 UE的某些业务， 如使用 SPS ( Semi-Persistent Scheduling, 半静态调度）或 ΤΉ ( Transmission Time Interval,传输时间间隔） Bundling (绑 定 )传输的 VoIP ( Voice over Internet Protocol, 基于 IP协议的语音技术 )等 业务， 本身就有很高的抗干扰特性， 则在长 CoMP去激活状态下， UE的业务 传输也可以是重传和新传都不使用 CoMP模式， 从而可以进一步节省 X2 口 资源和网络资源。
当 UE的状态切换到长 CoMP激活状态的时候， eNodeB对 UE的操作流 程如图 4所示， eNodeB对 UE的业务不管新传重传都是用 CoMP,使用 CoMP 的方式和长 CoMP去激活下使用 CoMP的方法类似， 具体步骤如下：
步骤 401 , eNodeB判断 HARQ是不是第一次传输，如果是重传则进入步 骤 402, 如果是第一次传输进入步骤 403;
步骤 402, 判断为重传的话， 统计重传累加次数的 M值加 1 ;
步骤 403 , 使用 CoMP进行上下行传输， 如上一个实施例的步骤 3描述； 步骤 404 , 统计 UE传输的次数 N;
步骤 405, 判断 N是否满足周期条件， 是则执行步骤 406, 否则执行步 骤 409;
步骤 406, 判断 UE反馈的是 ACK或者 UE反馈的 CRC正确， 执行步骤 407 , 判断 UE反馈的是 NACK或 UE反馈的 CRC不正确， 执行步骤 408; 步骤 407, 继续组织新传， 然后返回步骤 401 ;
步骤 408, 继续组织重传， 然后返回步骤 401 ; 步骤 409, 判断 Μ/Ν与第 二门限值（如门限值为 4 )的关系， 若 Μ/Ν>第二门限执行步骤 410; 若 Μ/Ν 第二门限执行步骤 411 ;
步骤 410, Μ/Ν>第二门限， 则继续使用长 CoMP激活模式进行传输， 并 转至步骤 406;
步骤 411 , M/N 第二门限则使用长 CoMP去激活模式进行传输， 进入 长 CoMP去激活流程。
为了系统实现方便简化处理流程， 可以考虑长 CoMP激活切换周期和长 CoMP去激活切换周期为同一个周期， 长 CoMP激活和去激活时候的重传比 例判断门限为一个值， 这样就可以简化实现的流程。 如图 5所示， 具体流程 描述如下：
步骤 501 , eNodeB判断 HARQ是否第一次传输并且长 CoMP传输未激活， 若是执行步骤 502, 若不是执行步骤 503;
步骤 502, 不使用 CoMP传输方式进行上下行业务传输， 执行步骤 506; 步骤 503 , 使用 CoMP方式进行上下行业务传输， 即对于下行传输的时 候 PDCCH中与 CoMP传输相关的 bit位置位（如写为 1 ) , 对应上行传输的 时候通知协作小区进行 CoMP接收并将数据通过 X2 口传给服务小区， 之后 执行步骤 504;
步骤 504, 判断这包数据是重传还是新传， 若是重传执行步骤 505, 若是 新传， 执行步骤 506;
步骤 505, 将统计重传的变量 M加 1 , 然后执行步骤 506;
步骤 506, 将统计 UE业务传输次数的计数 N的值加 1 ;
步骤 507 , 判断 N是否满足 CoMP切换统计周期， 若 N满足条件即 N>CoMP切换统计周期则执行步骤 508, 若 N不满足条件， 则执行步骤 7; 步骤 508, 判断 M/N的值与重传比例门限值大小的比较， 当 M/N大于门 限值， 则执行步骤 509, M/N小于等于门限值， 则执行步骤 510;
步骤 509, 将该 UE置为长 CoMP激活传输方式， 执行步骤 511 ;
步骤 510, 将该 UE置为长 CoMP去激活传输方式， 执行步骤 511 ; 步骤 511 , eNodeB根据 UE反馈的 ACK/NACK或上行业务的 CRC信息组织新传 或重传， 再返回步骤 501。
此外，本发明实施例中还提供了一种基于重传触发多点协作传输的系统， 该系统主要包括：
统计模块， 设置为统计 CoMP类型 UE业务传输时的重传比例； 切换触发模块， 设置为根据所述统计模块统计的重传比例是否超出预定 的触发门限， 确定所述 UE的业务传输是否使用 CoMP方式传输。
所述统计模块统计的重传比例是指， 在一个统计周期内， 发生 HARQ重 传的次数与传输总次数的比值；
所述切换触发模块设置为， 若所述重传比例超出预定的触发门限， 则确 定所述 UE的业务传输使用 CoMP方式传输； 若所述重传比例没有超出预定 的触发门限， 则确定所述 UE的业务传输至少在新传时不使用 CoMP方式传 输。
较佳的， 所述系统还可包括初始配置模块，
所述初始配置模块设置为， 默认或配置所述 CoMP类型 UE的状态为长 CoMP去激活状态或长 CoMP激活状态；
其中， 所述 UE处于所述长 CoMP去激活状态下时， 业务传输的新传不 使用 CoMP方式传输， 重传使用 CoMP方式传输； 或者， 新传和重传均不使 用 CoMP方式传输；
所述 UE处于所述长 CoMP激活状态下时， 业务传输的新传和重传均使 用 CoMP方式传输。
较佳的， 所述统计模块设置为， 所述 UE处于所述长 CoMP去激活状态 下时， 在每个第一周期结束时统计该周期内的重传比例；
所述切换触发模块设置为， 若所述统计模块统计的本周期内的重传比例 高于第一触发门限， 则将所述 UE的状态切换为长 CoMP激活状态； 否则， 所述 UE的状态在下个第一周期内仍为长 CoMP去激活状态。
较佳的， 所述统计模块设置为， 所述 UE处于所述长 CoMP激活状态下 时， 在每个第二周期结束时统计该周期内的重传比例；
所述切换触发模块设置为， 若统计的本周期内的重传比例低于第二触发 门限， 则将所述 UE的状态切换为长 CoMP去激活状态； 否则， 所述 UE的 状态在下个第二周期内仍为长 CoMP激活状态；
其中， 所述第一周期和第二周期通过子帧数或调度次数确定， 且所述第 一周期和第二周期相等或不相等。
较佳的， 所述统计模块设置为， 对于传输的上行数据， 统计的所述重传 比例包括收到 NACK反馈的次数占传输总次数的比例；对于传输的下行数据， 统计的所述重传比例包括检测到 CRC错误的次数占传输总次数的比例。
较佳的， 所述切换触发模块设置为， 在所述 UE 业务传输中， 在用于 PDSCH资源分配指示的 PDCCH中包含激活指示信息， 指示本次传输是否使 用 CoMP方式。
以上仅为本发明的优选实施案例而已， 并不用于限制本发明， 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情况下， 熟悉本领域 的技术人员可根据本发明做出各种相应的改变和变形， 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。
显然， 本领域的技术人员应该明白， 上述的本发明的各模块或各步骤可 以用通用的计算装置来实现， 它们可以集中在单个的计算装置上， 或者分布 在多个计算装置所组成的网络上， 可选地， 它们可以用计算装置可执行的程 序代码来实现， 从而， 可以将它们存储在存储装置中由计算装置来执行， 并 且在某些情况下， 可以以不同于此处的顺序执行所示出或描述的步骤， 或者 将它们分别制作成各个集成电路模块， 或者将它们中的多个模块或步骤制作 成单个集成电路模块来实现。 这样， 本发明不限制于任何特定的硬件和软件 结合。
工业实用性
本发明提出了一种基于重传激活 CoMP的机制， 当 UE往小区边缘移动 时， UE测量本小区的 RSRP ( Reference Signal Receiving Power, 参考信号接 收功率 )逐渐变小， 邻区的干扰越来越大， eNodeB (演进的节点 B )根据 UE 测量的本区的 RSRP和邻区的 RSRP然后参照给定的门限来触发 UE是否进行 CoMP传输。这种情况下， 由于无线信道的复杂多变性以及 UE测量的准确性 等因素影响， 存在某些 UE的某些业务会进行不必要的 CoMP传输。 使用本 发明提出的基于重传激活的 CoMP机制可以避免这种情况的发生， 使得系统 根据无线信道的实际状况进行自适应的开关 CoMP传输的功能， 降低由于使 用不必要的 CoMP传输所带来的开销， 提高网路的容量。

Claims

权 利 要 求 书
1、 一种触发多点协作传输的方法， 其包括：
在进行多点协作 （CoMP )类型用户设备 ( UE ) 的业务传输时， 根据统 计的重传比例是否超出预定的触发门限， 确定所述 UE的业务传输是否使用 CoMP方式传输。
2、 如权利要求 1所述的方法， 其中，
所述重传比例是指，在一个统计周期内，发生混合自动重传请求（ HARQ ) 重传的次数与传输总次数的比值；
所述根据统计的重传比例是否超出预定的触发门限， 确定所述 UE的业 务传输是否使用 CoMP方式传输的步骤包括：
若所述重传比例超出预定的触发门限， 则确定所述 UE的业务传输使用 CoMP方式传输；
若所述重传比例没有超出预定的触发门限， 则确定所述 UE的业务传输 至少在新传时不使用 CoMP方式传输。
3、 如权利要求 1所述的方法， 其还包括：
服务小区将 UE配置为 CoMP类型 UE时，默认或配置所述 UE的状态为 长 CoMP去激活状态或长 CoMP激活状态；
其中， 所述 UE处于所述长 CoMP去激活状态下时， 业务传输的新传不 使用 CoMP方式传输， 重传使用 CoMP方式传输； 或者， 新传和重传均不使 用 CoMP方式传输；
所述 UE处于所述长 CoMP激活状态下时， 业务传输的新传和重传均使 用 CoMP方式传输。
4、 如权利要求 3所述的方法， 其中：
所述根据统计的重传比例是否超出预定的触发门限， 确定所述 UE的业 务传输是否使用 CoMP方式传输的步骤包括：
所述 UE处于所述长 CoMP去激活状态下时， 在每个第一周期结束时统 计该周期内的重传比例， 若统计的该周期内的重传比例高于第一触发门限， 则将所述 UE的状态切换为长 CoMP激活状态； 若统计的该周期内的重传比 例低于或等于第一触发门限， 则保持所述 UE的状态在下个第一周期内仍为 长 CoMP去激活状态。
5、 如权利要求 4所述的方法， 其中：
所述根据统计的重传比例是否超出预定的触发门限， 确定所述 UE的业 务传输是否使用 CoMP方式传输的步骤还包括：
所述 UE处于所述长 CoMP激活状态下时， 在每个第二周期结束时统计 该周期内的重传比例， 若统计的该周期内的重传比例低于第二触发门限， 则 将所述 UE的状态切换为长 CoMP去激活状态； 若统计的该周期内的重传比 例高于或等于第二触发门限， 则保持所述 UE的状态在下个第二周期内仍为 长 CoMP激活状态。
6、 如权利要求 5所述的方法， 其中，
所述第一周期和第二周期通过子帧数或调度次数确定， 且所述第一周期 和第二周期相等或不相等。
7、 如权利要求 1所述的方法， 其中，
对于传输的上行数据， 所述重传比例包括收到错误应答（NACK )反馈 的次数占传输总次数的比例；
对于传输的下行数据， 所述重传比例包括检测到循环冗余校验 ( CRC ) 错误的次数占传输总次数的比例。
8、 如权利要求 5所述的方法， 其还包括：
在所述 UE业务传输中， 在用于物理下行共享信道（PDSCH ) 资源分配 指示的物理下行控制信道（PDCCH ) 中包含激活指示信息， 指示本次传输是 否使用 CoMP方式。
9、 一种基于重传触发多点协作传输的系统， 其包括：
统计模块， 其设置为： 统计多点协作 （CoMP )类型用户设备（UE )业 务传输时的重传比例； 以及
切换触发模块， 其设置为： 根据所述统计模块统计的重传比例是否超出 预定的触发门限， 确定所述 UE的业务传输是否使用 CoMP方式传输。
10、 如权利要求 9所述的系统， 其中，
所述统计模块统计的重传比例是指， 在一个统计周期内， 发生 HARQ重 传的次数与传输总次数的比值；
所述切换触发模块是设置为： 若所述重传比例超出预定的触发门限， 则 确定所述 UE的业务传输使用 CoMP方式传输； 若所述重传比例没有超出预 定的触发门限， 则确定所述 UE的业务传输至少在新传时不使用 CoMP方式 传输。
11、 如权利要求 9所述的系统， 其还包括初始配置模块，
所述初始配置模块设置为： 默认或配置所述 CoMP类型 UE的状态为长 CoMP去激活状态或长 CoMP激活状态；
其中， 所述 UE处于所述长 CoMP去激活状态下时， 业务传输的新传不 使用 CoMP方式传输， 重传使用 CoMP方式传输； 或者， 新传和重传均不使 用 CoMP方式传输；
所述 UE处于所述长 CoMP激活状态下时， 业务传输的新传和重传均使 用 CoMP方式传输。
12、 如权利要求 11所述的系统， 其中，
所述统计模块是设置为以如下方式统计重传比例： 所述 UE处于所述长 CoMP去激活状态下时， 在每个第一周期结束时统计该周期内的重传比例； 所述切换触发模块是设置为： 若所述统计模块统计的本周期内的重传比 例高于第一触发门限， 则将所述 UE的状态切换为长 CoMP激活状态； 若所 述统计模块统计的本周期内的重传比例低于或等于第一触发门限， 则保持所 述 UE的状态在下个第一周期内仍为长 CoMP去激活状态。
13、 如权利要求 12所述的系统， 其中，
所述统计模块是设置为还以如下方式统计重传比例： ： 所述 UE处于所 述长 CoMP激活状态下时，在每个第二周期结束时统计该周期内的重传比例； 所述切换触发模块是设置为： 若统计的本周期内的重传比例低于第二触 发门限， 则将所述 UE的状态切换为长 CoMP去激活状态； 若所述统计模块 统计的本周期内的重传比例高于或等于第一触发门限， 则保持所述 UE的状 态在下个第二周期内仍为长 CoMP激活状态；
其中， 所述第一周期和第二周期通过子帧数或调度次数确定， 且所述第 一周期和第二周期相等或不相等。
14、 如权利要求 9、 10、 11、 12或 13之任一项所述的系统， 其中， 所述统计模块是设置为： 对于传输的上行数据， 统计的所述重传比例包 括收到 NACK反馈的次数占传输总次数的比例； 对于传输的下行数据， 统计 的所述重传比例包括检测到 CRC错误的次数占传输总次数的比例。
15、 如权利要求 9、 10、 11、 12或 13之任一项所述的系统， 其中， 所述切换触发模块还设置为： 在所述 UE业务传输中， 在用于 PDSCH资 源分配指示的 PDCCH中包含激活指示信息， 指示本次传输是否使用 CoMP 方式。
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