CN103686931B - A kind of cut-in method and device, user equipment - Google Patents
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Abstract
Description
技术领域technical field
本发明涉及中继系统中用户设备(UE,User Eqipment)接入技术,尤其涉及一种基于博弈论的接入方法及装置、用户设备。The present invention relates to a user equipment (UE, User Equipment) access technology in a relay system, in particular to a game theory-based access method and device, and user equipment.
背景技术Background technique
在高级长期演进(LTE-A,Long Term Evolution-Advanced)系统的中继小区中,由于中继节点(RN,Relay Node)的引入,用户设备(UE,User Eqipment)可以通过基站(eNB)接入网络,也可以通过RN接入网络。In the relay cell of the Long Term Evolution-Advanced (LTE-A, Long Term Evolution-Advanced) system, due to the introduction of the relay node (RN, Relay Node), the user equipment (UE, User Equipment) can connect to the access to the network, or access to the network through RN.
现有的大多数接入方法是使用参考信号(RS,Reference Signal)的强度最强(例如UE测量的参考信号接收功率(RSRP,Reference Signal Receiving Power)或者参考信号接收质量(RSRQ,Reference Signal Receiving Quality)最大)作为判断依据。例如,常用的UE接入策略为:当来自RN信号的接收功率Pr,RN比来自eNB信号的接收功率Pr,eNB大T1dB时,UE选择RN接入,否则选择eNB接入。Most of the existing access methods use the strongest reference signal (RS, Reference Signal) (for example, the reference signal received power (RSRP, Reference Signal Receiving Power) or the reference signal received quality (RSRQ, Reference Signal Receiving Power) measured by the UE Quality) maximum) as the basis for judgment. For example, a commonly used UE access strategy is: when the received power Pr, RN from the RN signal is T1dB greater than the received power Pr, eNB from the eNB signal, the UE selects the RN for access, otherwise selects the eNB for access.
在RN回传(backhaul)链路质量较好时,RN覆盖范围内的UE通过RN接入,理论上可以提高自身的传输速率。但是由于时频资源受限,中继小区中backhaul链路容易成为系统的瓶颈,RN覆盖范围内的UE都选择通过RN接入时会导致较长的调度和队列时延,从而影响系统平均吞吐量。When the quality of the backhaul (backhaul) link of the RN is good, the UE within the coverage of the RN accesses through the RN, which can theoretically increase its own transmission rate. However, due to limited time-frequency resources, the backhaul link in the relay cell is likely to become the bottleneck of the system. When UEs within the coverage of the RN choose to access through the RN, it will lead to long scheduling and queue delays, which will affect the average throughput of the system. quantity.
多个UE的接入选择受到互动关系的影响和制约。每个UE用户都希望提高自己的传输速率,于是在进行接入决策时会选择通过链路质量更好的RN接入,但是当UE都只通过RN接入时反而会由于调度和队列时延达不到事先期望的速率增益,从而降低了系统吞吐量。The access selection of multiple UEs is affected and restricted by the interaction relationship. Each UE user wants to increase its transmission rate, so when making an access decision, it will choose to access through the RN with better link quality, but when the UE only accesses through the RN, it will be delayed due to scheduling and queuing The rate gain expected in advance cannot be achieved, thereby reducing the system throughput.
发明内容Contents of the invention
有鉴于此,本发明的主要目的在于提供一种接入方法及装置、用户设备,能保证系统吞吐量增益,也保证了UE接入的公平性。In view of this, the main purpose of the present invention is to provide an access method and device, and user equipment, which can ensure system throughput gain and also ensure fairness of UE access.
为达到上述目的,本发明的技术方案是这样实现的:In order to achieve the above object, technical solution of the present invention is achieved in that way:
一种接入方法,所述方法包括:An access method, the method comprising:
UE确定中RN信号的接收功率与宿主基站信号的接收功率的差值在设定范围内时,根据所述UE接入所述RN的接入策略以及接入所述宿主基站的接入策略分别确定出所述UE接入所述RN及所述宿主基站的接入概率,以所确定的接入概率执行所述UE的接入。When the UE determines that the difference between the received power of the RN signal and the received power of the donor base station signal is within a set range, according to the UE's access strategy for accessing the RN and the access strategy for accessing the donor base station, respectively Determine the access probability for the UE to access the RN and the donor base station, and perform the access of the UE with the determined access probability.
优选地,所述UE确定RN信号的接收功率与宿主基站信号的接收功率的差值在设定范围内,为:Preferably, the UE determines that the difference between the received power of the RN signal and the received power of the donor base station signal is within a set range, which is:
所述UE确定所述RN信号的接收功率比所述宿主基站信号的接收功率大,且所述RN信号的接收功率与所述宿主基站信号的接收功率的差值小于等于设定的阈值。The UE determines that the received power of the RN signal is greater than the received power of the donor base station signal, and the difference between the received power of the RN signal and the received power of the donor base station signal is less than or equal to a set threshold.
优选地,所述方法还包括:Preferably, the method also includes:
所述RN确定自身小区的回传链路没有足够的无线承载RB资源为多个UE提供接入时,在每个传输时间间隔TTI内,为剩余的每个RB资源在所述多个UE中选择两个以上的UE并通知所述两个以上的UE基于竞争的方式接入该RB资源。When the RN determines that the backhaul link of its own cell does not have enough radio bearer RB resources to provide access for multiple UEs, within each transmission time interval TTI, for each of the remaining RB resources in the multiple UEs Selecting more than two UEs and notifying the two or more UEs to access the RB resource based on contention.
优选地,所述方法还包括:Preferably, the method also includes:
RN通知两个UE基于竞争的方式接入一个剩余的RB资源。The RN notifies two UEs to access a remaining RB resource based on contention.
优选地,所述根据所述UE接入所述RN的接入策略以及接入所述宿主基站的接入策略分别确定出所述UE接入所述RN及所述宿主基站的混合接入策略均衡解,包括:Preferably, the hybrid access strategy for the UE to access the RN and the donor base station is respectively determined according to the access strategy for the UE to access the RN and the access strategy for accessing the donor base station Equilibrium solutions, including:
假设UEi的接入策略为:UEi的收益Vi以当前TTI所允许的数据传输可达速率R表示;UEi选择接入策略si 1时始终获得收益为R=r;而选择接入策略Si 2时,如果对方选择相同接入策略,当优先级大于对方时获得收益为R=(1+m)r,其中m为选择RN接入获得的增益因子,0<m<1;当优先级小于对方时UE1不在当前TTI调度,收益为0,如果对方选择不同接入策略,获得收益R=(1+m)r;Assume that the access policy of UE i is: The revenue V i of UE i is represented by the achievable rate R of data transmission allowed by the current TTI; when UE i selects access strategy s i 1 , the revenue is always R=r; when selecting access strategy S i 2 , if the other party Choose the same access strategy, when the priority is higher than the other party, the gain is R=(1+m)r, where m is the gain factor obtained by selecting RN access, 0<m<1; when the priority is lower than the other party, UE 1 Not in the current TTI scheduling, the income is 0, if the other party chooses a different access strategy, the income R=(1+m)r;
确定满足下式的混合接入策略:Determine the hybrid access policy that satisfies the following formula:
其中,s1 *和s2 *为博弈的均衡接入策略;Among them, s 1 * and s 2 * are the equilibrium access strategies of the game;
根据不完全信息静态博弈模型的虚拟参与者对优先级进行概率选择,得到相应的博弈树;According to the virtual participants of the incomplete information static game model, the priority is selected by probability, and the corresponding game tree is obtained;
根据所述博弈树确定UE2的混合接入策略选择概率,为(p2,1-p2),则有下式:Determine the hybrid access strategy selection probability of UE 2 according to the game tree, which is (p 2 , 1-p 2 ), then there is the following formula:
Max V2=P(K1>K2)[p1 *(p2*r+(1-p2)*(1+m)r)+(1-p1 *)(p2*r+(1-p2)*0)]+Max V 2 =P(K 1 >K 2 )[p 1 * (p 2 *r+(1-p 2 )*(1+m)r)+(1-p 1 * )(p 2 *r+(1 -p 2 )*0)]+
P(K1<K2)[p1 *(p2*r+(1-p2)*(1+m)r)+(1-p1 *)(p2*r+(1-p2)*(1+m)r)]P(K 1 <K 2 )[p 1 * (p 2 *r+(1-p 2 )*(1+m)r)+(1-p 1 * )(p 2 *r+(1-p 2 ) *(1+m)r)]
其中,(p1 *,1-p1 *)为U1的混合接入策略均衡解;Among them, (p 1 * , 1-p 1 * ) is U 1 's hybrid access strategy equilibrium solution;
假设UEi的优先级Ki为均匀分布,则(K1,K2)为联合二维均匀分布,则P(K1<K2)=P(K1>K2)=0.5;当p2取得均衡解时,有p1 *=p2 *=p*;且下式成立:Assuming that the priority K i of UE i is uniformly distributed, then (K 1 , K 2 ) is a joint two-dimensional uniform distribution, then P(K 1 <K 2 )=P(K 1 >K 2 )=0.5; when p 2 When the equilibrium solution is obtained, p 1 * =p 2 * =p * ; and the following formula holds:
V2(p2 *=p*)=V2(s2 2),即:V 2 (p 2 * = p * ) = V 2 (s 2 2 ), namely:
0.5[p*(p**r+(1-p*)*(1+m)r)+(1-p*)(p**r+(1-p*)*0)]+0.5[p * (p * *r+(1-p * )*(1+m)r)+(1-p * )(p * *r+(1-p * )*0)]+
0.5[p*(p**r+(1-p*)*(1+m)r)+(1-p*)(p**r+(1-p*)*(1+m)r)]=0.5[p * (p * *r+(1-p * )*(1+m)r)+(1-p * )(p * *r+(1-p * )*(1+m)r)] =
0.5(1+m)p**r+0.5(1+m)*r0.5(1+m)p * *r+0.5(1+m)*r
解得 Solutions have to
确定U1的混合接入策略均衡解为 Determine the hybrid access strategy equilibrium solution of U 1 as
以接入所述RN及所述宿主基站的混合接入策略均衡解分别作为接入所述RN及所述宿主基站的接入概率。The hybrid access policy equilibrium solution for accessing the RN and the donor base station is used as the access probability of accessing the RN and the donor base station respectively.
一种接入装置,所述装置包括第一确定单元、第二确定单元和执行单元,其中:An access device, the device comprising a first determination unit, a second determination unit, and an execution unit, wherein:
第一确定单元,用于确定RN信号的接收功率与宿主基站信号的接收功率的差值在设定范围内时,触发第二确定单元;The first determination unit is configured to trigger the second determination unit when the difference between the received power of the RN signal and the received power of the donor base station signal is within a set range;
第二确定单元,用于根据接入所述RN的接入策略以及接入所述宿主基站的接入策略分别确定出接入所述RN及所述宿主基站的接入概率;The second determination unit is configured to determine the access probabilities of accessing the RN and the donor base station respectively according to the access strategy for accessing the RN and the access strategy for accessing the donor base station;
执行单元,以所确定的接入概率执行接入。An executing unit, configured to execute access with the determined access probability.
优选地,所述第一确定单元还用于,确定所述RN信号的接收功率比所述宿主基站信号的接收功率大,且所述RN信号的接收功率与所述宿主基站信号的接收功率的差值小于等于设定的阈值时,确定中继节点RN信号的接收功率与宿主基站信号的接收功率的差值在设定范围内。Preferably, the first determining unit is further configured to determine that the received power of the RN signal is greater than the received power of the donor base station signal, and the received power of the RN signal is greater than the received power of the donor base station signal When the difference is less than or equal to the set threshold, it is determined that the difference between the received power of the relay node RN signal and the received power of the donor base station signal is within a set range.
优选地,所述装置还包括:Preferably, the device also includes:
接收单元,用于接收所述RN确定自身小区的回传链路没有足够的RB资源为多个UE提供接入时,在每个TTI内,为剩余的每个RB资源在所述多个UE中选择两个以上的UE,该两个以上的UE基于竞争的方式接入该RB资源的通知。The receiving unit is configured to receive, when the RN determines that the backhaul link of its own cell does not have enough RB resources to provide access for multiple UEs, within each TTI, for each of the remaining RB resources in the multiple UEs Two or more UEs are selected from among them, and the two or more UEs access the RB resource in a contention-based manner.
优选地,所述接收单元还用于,接收来自所述RN的两个UE基于竞争的方式接入一个剩余的RB资源的通知。Preferably, the receiving unit is further configured to receive a notification from the RN that two UEs access a remaining RB resource based on contention.
优选地,所述第二确定单元还用于以下述方式确定接入所述RN及所述宿主基站的接入概率:Preferably, the second determining unit is further configured to determine the access probability of accessing the RN and the donor base station in the following manner:
假设UEi的接入策略为:UEi的收益Vi以当前TTI所允许的数据传输可达速率R表示;UEi选择接入策略si 1时始终获得收益为R=r;而选择接入策略Si 2时,如果对方选择相同接入策略,当优先级大于对方时获得收益为R=(1+m)r,其中m为选择RN接入获得的增益因子,0<m<1;当优先级小于对方时UE1不在当前TTI调度,收益为0,如果对方选择不同接入策略,获得收益R=(1+m)r;Assume that the access policy of UE i is: The revenue V i of UE i is represented by the achievable rate R of data transmission allowed by the current TTI; when UE i selects access strategy s i 1 , the revenue is always R=r; when selecting access strategy S i 2 , if the other party Choose the same access strategy, when the priority is higher than the other party, the gain is R=(1+m)r, where m is the gain factor obtained by selecting RN access, 0<m<1; when the priority is lower than the other party, UE 1 Not in the current TTI scheduling, the income is 0, if the other party chooses a different access strategy, the income R=(1+m)r;
确定满足下式的混合接入策略:Determine the hybrid access policy that satisfies the following formula:
其中,s1 *和s2 *为博弈的均衡接入策略;Among them, s 1 * and s 2 * are the equilibrium access strategies of the game;
根据不完全信息静态博弈模型的虚拟参与者对优先级进行概率选择,得到相应的博弈树;According to the virtual participants of the incomplete information static game model, the priority is selected by probability, and the corresponding game tree is obtained;
根据所述博弈树确定UE2的混合接入策略选择概率,为(p2,1-p2),则有下式:Determine the hybrid access strategy selection probability of UE 2 according to the game tree, which is (p 2 , 1-p 2 ), then there is the following formula:
Max V2=P(K1>K2)[p1 *(p2*r+(1-p2)*(1+m)r)+(1-p1 *)(p2*r+(1-p2)*0)]+Max V 2 =P(K 1 >K 2 )[p 1 * (p 2 *r+(1-p 2 )*(1+m)r)+(1-p 1 * )(p 2 *r+(1 -p 2 )*0)]+
P(K1<K2)[p1 *(p2*r+(1-p2)*(1+m)r)+(1-p1 *)(p2*r+(1-p2)*(1+m)r)]P(K 1 <K 2 )[p 1 * (p 2 *r+(1-p 2 )*(1+m)r)+(1-p 1 * )(p 2 *r+(1-p 2 ) *(1+m)r)]
其中,(p1 *,1-p1 *)为U1的混合接入策略均衡解;Among them, (p 1 * , 1-p 1 * ) is U 1 's hybrid access strategy equilibrium solution;
假设UEi的优先级Ki为均匀分布,则(K1,K2)为联合二维均匀分布,则P(K1<K2)=P(K1>K2)=0.5;当p2取得均衡解时,有p1 *=p2 *=p*;且下式成立:Assuming that the priority K i of UE i is uniformly distributed, then (K 1 , K 2 ) is a joint two-dimensional uniform distribution, then P(K 1 <K 2 )=P(K 1 >K 2 )=0.5; when p 2 When the equilibrium solution is obtained, p 1 * =p 2 * =p * ; and the following formula holds:
V2(p2 *=p*)=V2(s2 2),即:V 2 (p 2 * = p * ) = V 2 (s 2 2 ), namely:
0.5[p*(p**r+(1-p*)*(1+m)r)+(1-p*)(p**r+(1-p*)*0)]+0.5[p * (p * *r+(1-p * )*(1+m)r)+(1-p * )(p * *r+(1-p * )*0)]+
0.5[p*(p**r+(1-p*)*(1+m)r)+(1-p*)(p**r+(1-p*)*(1+m)r)]=0.5[p * (p * *r+(1-p * )*(1+m)r)+(1-p * )(p * *r+(1-p * )*(1+m)r)] =
0.5(1+m)p**r+0.5(1+m)*r0.5(1+m)p * *r+0.5(1+m)*r
解得 Solutions have to
确定U1的混合接入策略均衡解为 Determine the hybrid access strategy equilibrium solution of U 1 as
以接入所述RN及所述宿主基站的混合接入策略均衡解分别作为接入所述RN及所述宿主基站的接入概率。The hybrid access policy equilibrium solution for accessing the RN and the donor base station is used as the access probability of accessing the RN and the donor base station respectively.
一种用户设备,包括前述的接入装置。A user equipment includes the aforementioned access device.
本发明中,UE确定RN信号的接收功率与宿主基站(Donor eNB)信号的接收功率的差值在设定范围内时,根据UE接入RN的接入策略以及接入宿主基站的接入策略分别确定出UE接入所述RN及宿主基站的混合接入策略均衡解;以UE接入RN及宿主基站的混合接入策略均衡解分别作为UE接入RN及宿主基站的接入概率,执行所述UE的接入。本发明通过基于博弈的策略,可以降低backhaul链路瓶颈带来的负面影响,在一定程度上保证了系统吞吐量增益,同时也保证了UE接入的公平性。In the present invention, when the UE determines that the difference between the received power of the RN signal and the received power of the donor base station (Donor eNB) signal is within the set range, according to the UE's access strategy for accessing the RN and the access strategy for accessing the donor base station Determine the hybrid access strategy equilibrium solution for the UE to access the RN and the donor base station respectively; use the hybrid access strategy equilibrium solution for the UE to access the RN and the donor base station as the access probabilities of the UE's access to the RN and the donor base station, respectively, and execute Access of the UE. The present invention can reduce the negative impact brought by the bottleneck of the backhaul link through the game-based strategy, guarantee the system throughput gain to a certain extent, and also ensure the fairness of UE access.
附图说明Description of drawings
图1为本发明实施例的接入方法的流程图;FIG. 1 is a flowchart of an access method according to an embodiment of the present invention;
图2为本发明实施例的接入模型的收益博弈树的结构示意图;2 is a schematic structural diagram of a revenue game tree of an access model according to an embodiment of the present invention;
图3为本发明实施例的接入装置的组成结构示意图。FIG. 3 is a schematic diagram of the composition and structure of an access device according to an embodiment of the present invention.
具体实施方式detailed description
本发明的基本思想为:UE确定RN信号的接收功率与宿主基站信号的接收功率的差值在设定范围内时,根据UE接入RN的接入策略以及接入宿主基站的接入策略分别确定出UE接入所述RN及宿主基站的混合接入策略均衡解;以UE接入RN及宿主基站的混合接入策略均衡解分别作为UE接入RN及宿主基站的接入概率,执行所述UE的接入。The basic idea of the present invention is: when the UE determines that the difference between the received power of the RN signal and the received power of the signal of the donor base station is within the set range, according to the access strategy of the UE to access the RN and the access strategy of the access to the donor base station, respectively Determine the hybrid access strategy equilibrium solution for the UE to access the RN and the donor base station; use the hybrid access strategy equilibrium solution for the UE to access the RN and the donor base station as the access probabilities of the UE's access to the RN and the donor base station, respectively, and execute the access of the UE.
为使本发明的目的、技术方案和优点更加清楚明白,以下举实施例并参照附图,对本发明进一步详细说明。In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail by citing the following embodiments and referring to the accompanying drawings.
图1为本发明实施例的接入方法的流程图,如图1所示,本示例的接入方法包括以下步骤:Fig. 1 is the flowchart of the access method of the embodiment of the present invention, as shown in Fig. 1, the access method of this example includes the following steps:
步骤101,UE确定RN信号的接收功率与Donor eNB信号的接收功率的差值在设定范围内时,根据UE接入RN的接入策略以及接入Donor eNB的接入策略分别确定出UE接入所述RN及Donor eNB的混合接入策略均衡解。Step 101, when the UE determines that the difference between the received power of the RN signal and the received power of the Donor eNB signal is within the set range, determine the UE's access strategy according to the access strategy of the UE to the RN and the access strategy of the Donor eNB. Enter the hybrid access policy equilibrium solution of the RN and Donor eNB.
基于RS强度最强(例如UE测量的RSRP或者RSRQ最大)的接入策略不可避免地引入了较大的干扰或造成中继回传链路的拥塞,给中继系统总体性能带来负面影响,尤其是当来自eNB和RN的RS的强度相近时,这种负面的影响尤其大。The access strategy based on the strongest RS strength (such as the largest RSRP or RSRQ measured by the UE) inevitably introduces greater interference or causes congestion on the relay backhaul link, which has a negative impact on the overall performance of the relay system. Especially when the strengths of RSs from eNB and RN are similar, this negative impact is particularly large.
本发明中,在Donor eNB和RN小区覆盖边缘区域,多个UE接入策略的选择可以利用博弈论进行分析,当0<Pr,RN-Pr,eNB<=T1时,这时UE既可以选择eNB,也可以选择RN接入。T1为设定阈值。UE对接入点的选择可以看作一次博弈行为,可以通过混合接入策略均衡解来确定UE接入Donor eNB和RN的概率,使得每个UE接入远程接入点(RAP,Remote AccessPoint)后的平均收益最大化,进而使得每个用户至少获得与在Donor eNB小区中相同的传输可达速率r。In the present invention, in the edge area covered by Donor eNB and RN cells, the selection of multiple UE access strategies can be analyzed using game theory. When 0<P r, RN -P r, eNB <= T 1 , then UE Either eNB or RN can be selected for access. T 1 is the set threshold. The UE's choice of access point can be regarded as a game behavior. The probability of UE accessing Donor eNB and RN can be determined through the hybrid access strategy equilibrium solution, so that each UE accesses a remote access point (RAP, Remote AccessPoint) The final average revenue is maximized, so that each user can obtain at least the same transmission rate r as in the Donor eNB cell.
当RN小区有足够的无线承载(RB,Radio Bear)资源能够提供给多个用户的接入申请时,根据参考信号RS强度(例如UE测量的RSRP或者RSRQ),RN可以某种规则分配不同RB给不同的用户进行接入,这种情况下不需要博弈。当RN小区由于回传链路信道质量不好或有大量UE需要接入RN小区(如热点小区)造成回传链路传输拥塞时,没有足够的RB资源能够提供给多个用户的接入申请,即部分或者全部RB上都存在多于一个用户需要竞争接入,需要选择RS接收强度最强、并且都满足0<Pr,RN-Pr,eNB<=T1的两个UE进行博弈,剩余的UE不能够在本RB上博弈。对于剩余的UE,可以采用搜索只调度单个用户的RB并与之博弈的方式接入系统。When the RN cell has enough radio bearer (RB, Radio Bear) resources to provide access applications for multiple users, according to the reference signal RS strength (such as RSRP or RSRQ measured by the UE), the RN can allocate different RBs according to a certain rule Access to different users, no game is required in this case. When the RN cell has backhaul link transmission congestion due to poor channel quality of the backhaul link or a large number of UEs need to access the RN cell (such as a hotspot cell), there are not enough RB resources to provide access applications for multiple users , that is, there are more than one users on some or all RBs that need to compete for access, and two UEs with the strongest RS receiving strength and both satisfying 0<P r, RN -P r, eNB <= T 1 need to be selected for game , the remaining UEs cannot play games on this RB. For the remaining UEs, the system can be accessed by searching for RBs that only schedule a single user and playing games with them.
假设博弈过程的参与者为UE1和UE2,RN在每个传输时间间隔(TTI,TransmissionTime Interval)内在相同的RB资源块上只能调度一个用户,调度策略是基于优先级的,用Ki表示UEi(i=1,2)的优先级。当UE1和UE2都通过RN接入时,如果K1>K2,则RN在当前TTI调度UE1,如果K1<K2,则在当前TTI调度UE2(为简化分析,暂时忽略K1=K2的情况)。Assuming that the participants in the game process are UE 1 and UE 2 , RN can only schedule one user on the same RB resource block in each transmission time interval (TTI, TransmissionTime Interval), and the scheduling strategy is based on priority, using K i Indicates the priority of UE i (i=1, 2). When both UE 1 and UE 2 are accessed through RN, if K 1 >K 2 , then RN schedules UE 1 in the current TTI, and if K1<K2, then schedules UE 2 in the current TTI (to simplify the analysis, temporarily ignore K 1 = case of K 2 ).
UEi的接入策略表示如下:i=1,2。UEi的收益Vi用在当前TTI所允许的数据传输可达速率以R表示。假设UEi选择接入策略si 1时始终获得收益为R=r,选择接入策略Si 2时有两种可能:如果对方选择相同接入策略,当优先级大于对方时获得收益为R=(1+m)r,其中0<m<1为选择RN接入获得的增益因子,当优先级小于对方时不在当前TTI调度,收益为0;如果对方选择不同接入策略,不存在竞争,获得收益R=(1+m)r。本发明中,接入策略即是表示接入宿主基站的各种接入策略以及接入中继节点的各种接入策略等,这些接入策略都是由网络侧根据自身的无线资源占用状况及UE的接入特点等确定的,可以配置于UE中。由于接入策略因通信系统的差异而不同,其并非实现技术方案的重点,也非难点,这里不再赘述各种接入策略。本领域技术人员应当理解,根据通信系统及UE的接入能力等确定接入策略是容易实现的。The access policy of UE i is expressed as follows: i=1,2. The revenue V i of UE i is denoted as R by the achievable rate of data transmission allowed in the current TTI. Assume that when UE i chooses the access strategy s i 1 , it always obtains the revenue R=r, and there are two possibilities when selecting the access strategy S i 2 : if the other party chooses the same access strategy, when the priority is higher than that of the other party, the revenue obtained is R =(1+m)r, where 0<m<1 is the gain factor obtained by selecting RN access. When the priority is lower than that of the other party, it will not be scheduled in the current TTI, and the benefit is 0; if the other party chooses a different access strategy, there is no competition , to obtain the income R=(1+m)r. In the present invention, the access strategy refers to various access strategies for accessing the host base station and various access strategies for accessing the relay node. These access strategies are determined by the network side according to its own wireless resource occupation status and the access characteristics of the UE, etc., can be configured in the UE. Since the access strategy is different due to the difference of the communication system, it is not the key point of the technical solution, nor is it difficult, so the various access strategies will not be repeated here. Those skilled in the art should understand that it is easy to determine the access policy according to the communication system and the access capability of the UE.
由于UEi只能知道自身的优先级类型,不能知道对方的优先级类型,因此这是一个不完全信息静态博弈。确定是否存在一种混合接入策略满足下式:Since UE i can only know its own priority type, but not the other party's priority type, this is a static game with incomplete information. Determine whether there is a hybrid access policy that satisfies the following formula:
其中,s1 *和s2 *是博弈的均衡接入策略。Among them, s 1 * and s 2 * are the equilibrium access strategies of the game.
由于用户间的对称性,不妨以UE2作为考查对象。引入不完全信息静态博弈模型的虚拟参与者“自然”(用N表示)对优先级进行概率选择,得到如图所示的博弈树。由于图2中的博弈树清晰地示出了树干及其子节点及子节点的关系,对本领域技术人员而言其结构是相当清楚的,这里不再赘述其结构细节。Due to the symmetry between users, UE 2 may be taken as the object of investigation. The virtual participant "naturally" (denoted by N) that introduces the static game model of incomplete information makes a probability selection on the priority, and the game tree shown in the figure is obtained. Since the game tree in FIG. 2 clearly shows the tree trunk and its sub-nodes and the relationship between sub-nodes, its structure is quite clear to those skilled in the art, and its structural details will not be repeated here.
假设UE2的混合接入策略选择概率为(p2,1-p2),则Assuming that the hybrid access strategy selection probability of UE 2 is (p 2 , 1-p 2 ), then
Max V2=P(K1>K2)[p1 *(p2*r+(1-p2)*(1+m)r)+(1-p1 *)(p2*r+(1-p2)*0)]+P(K1<K2)[p1 *(p2*r+(1-p2)*(1+m)r)+(1-p1 *)(p2*r+(1-p2)*(1+m)r)]Max V 2 =P(K 1 >K 2 )[p 1 * (p 2 *r+(1-p 2 )*(1+m)r)+(1-p 1 * )(p 2 *r+(1 -p 2 )*0)]+P(K 1 <K 2 )[p 1 * (p 2 *r+(1-p 2 )*(1+m)r)+(1-p 1 * )(p 2 *r+(1-p 2 )*(1+m)r)]
其中(p1 *,1-p1 *)是UE1的混合接入策略均衡解。Where (p 1 * , 1-p 1 * ) is the hybrid access policy equilibrium solution of UE 1 .
假设UEi的优先级Ki是均匀分布,则(K1,K2)是联合二维均匀分布,则P(K1<K2)=P(K1>K2)=0.5。当p2取得均衡解时,由于用户间的对称性,有p1 *=p2 *=p*。根据混合接入策略取得均衡解时与采用纯接入策略直接选择接入应该具有相同的收益,所以当UE2以p2取得均衡解时的收益应该与UE2采用纯接入策略直接选择接入RN的收益相等(此时UE2收益大于采用纯接入策略直接选择接入eNB的收益),可以得到:Assuming that the priority K i of UE i is a uniform distribution, then (K 1 , K 2 ) is a joint two-dimensional uniform distribution, then P(K 1 <K 2 )=P(K 1 >K 2 )=0.5. When p 2 obtains an equilibrium solution, p 1 * = p 2 * = p * due to the symmetry among users. Obtaining the equilibrium solution according to the hybrid access strategy should have the same benefit as using the pure access strategy to directly select access, so when UE 2 obtains the equilibrium solution with p 2 , the benefit should be the same as that of UE 2 using the pure access strategy to directly select access. The income of entering RN is equal (at this time, the income of UE 2 is greater than the income of directly selecting access to eNB by adopting the pure access strategy), and it can be obtained:
V2(p2 *=p*)=V2(s2 2),即V 2 (p 2 * = p * ) = V 2 (s 2 2 ), namely
0.5[p*(p**r+(1-p*)*(1+m)r)+(1-p*)(p**r+(1-p*)*0)]+0.5[p * (p * *r+(1-p * )*(1+m)r)+(1-p * )(p * *r+(1-p * )*0)]+
0.5[p*(p**r+(1-p*)*(1+m)r)+(1-p*)(p**r+(1-p*)*(1+m)r)]=0.5[p * (p * *r+(1-p * )*(1+m)r)+(1-p * )(p * *r+(1-p * )*(1+m)r)] =
0.5(1+m)p**r+0.5(1+m)*r0.5(1+m)p * *r+0.5(1+m)*r
解得 Solutions have to
因此得到UEi的混合接入策略均衡解为即以的概率选择通过宿主基站接入,以的概率选择通过RN接入。例如当m=0.5时,混合接入策略均衡解为表示用户接入宿主基站和RN的概率分别为1/3和2/3。Therefore, the hybrid access strategy equilibrium solution of UE i is obtained as That is to say The probability of choosing to access through the host base station, with The probability of choosing to access through RN. For example, when m=0.5, the hybrid access strategy equilibrium solution is Indicates that the probability of the user accessing the donor base station and the RN is 1/3 and 2/3, respectively.
步骤102,以UE接入RN及宿主基站的混合接入策略均衡解分别作为UE接入RN及宿主基站的接入概率,执行UE的接入。Step 102, using the hybrid access policy equilibrium solution of UE's access to RN and donor base station as the access probabilities of UE's access to RN and donor base station, respectively, to perform UE access.
UE1以的概率选择接入宿主基站,以的概率选择通过接入RN。UE 1 with The probability of choosing to access the donor base station, with The probability of is selected by accessing the RN.
在混合接入策略均衡解的接入策略下,考察用户收益,得到Equilibrium solution in hybrid access strategy Under the access strategy of , examine the user income, and get
Vi=r,i=1,2V i = r, i = 1, 2
这说明用户收益与通过RN接入时的增益因子大小与m无关。本发明的接入策略下,每个用户至少获得与在纯eNB小区中相同的传输可达速率r。因此,本发明的接入方法保证了UE在小区中统计平均的可达速率下界,同时在基于优先级的调度方式下保证了用户间的公平性。This shows that the user benefit has nothing to do with the gain factor when accessing through the RN and m. Under the access strategy of the present invention, each user at least obtains the same achievable transmission rate r as in a pure eNB cell. Therefore, the access method of the present invention guarantees the lower limit of statistically average attainable rate of the UE in the cell, and at the same time ensures the fairness among users in the priority-based scheduling mode.
本发明以两个UE博弈某TTI内的RB而实现一个UE的接入,从而实现基于保证接入RN及宿主基站相同的收益的方式使UE接入到RN及宿主基站之一,但本发明并不仅限于两个UE在一个TTI的接入博弈,也可以是三个以上的UE博弈某TTI内的RB,其实现方式与前述的两个UE在一个TTI的接入博弈的方式基本相同,这里不再赘述其细节。In the present invention, two UEs game RBs in a certain TTI to realize the access of a UE, so that the UE can access one of the RN and the donor base station based on ensuring the same income for accessing the RN and the donor base station, but the present invention It is not limited to the access game between two UEs in one TTI, it can also be more than three UEs game for RBs in a certain TTI. The details will not be repeated here.
图3为本发明实施例的接入装置的组成结构示意图,如图3所示,本发明的接入装置包括第一确定单元30、第二确定单元31和执行单元32,其中:FIG. 3 is a schematic diagram of the composition and structure of an access device according to an embodiment of the present invention. As shown in FIG. 3 , the access device of the present invention includes a first determination unit 30, a second determination unit 31, and an execution unit 32, wherein:
第一确定单元30,用于确定RN信号的接收功率与宿主基站信号的接收功率的差值在设定范围内时,触发第二确定单元31;The first determination unit 30 is configured to trigger the second determination unit 31 when the difference between the received power of the RN signal and the received power of the donor base station signal is within a set range;
第二确定单元31,用于根据接入所述RN的接入策略以及接入所述宿主基站的接入策略分别确定出接入所述RN及所述宿主基站的混合接入策略均衡解,以接入所述RN及所述宿主基站的混合接入策略均衡解分别作为接入所述RN及所述宿主基站的接入概率;The second determining unit 31 is configured to respectively determine a hybrid access strategy equilibrium solution for accessing the RN and the donor base station according to the access strategy for accessing the RN and the access strategy for accessing the donor base station, Using the hybrid access strategy equilibrium solution for accessing the RN and the donor base station as access probabilities for accessing the RN and the donor base station, respectively;
执行单元32,以所确定的接入概率执行接入。The executing unit 32 is configured to execute access with the determined access probability.
上述第一确定单元30还用于,确定所述RN信号的接收功率比所述宿主基站信号的接收功率大,且所述RN信号的接收功率与所述宿主基站信号的接收功率的差值小于等于设定的阈值时,确定中继节点RN信号的接收功率与宿主基站信号的接收功率的差值在设定范围内。The first determination unit 30 is further configured to determine that the received power of the RN signal is greater than the received power of the donor base station signal, and the difference between the received power of the RN signal and the received power of the donor base station signal is less than When it is equal to the set threshold, it is determined that the difference between the received power of the relay node RN signal and the received power of the donor base station signal is within the set range.
在图3所示的接入装置的基础上,所述装置还包括:接收单元(图3中未示出),用于接收所述RN确定自身小区的回传链路没有足够的RB资源为多个UE提供接入时,在每个TTI内,为剩余的每个RB资源在所述多个UE中选择两个以上的UE,该两个以上的UE基于竞争的方式接入该RB资源的通知。On the basis of the access device shown in FIG. 3 , the device further includes: a receiving unit (not shown in FIG. 3 ), configured to receive that the RN determines that the backhaul link of its own cell does not have enough RB resources for When multiple UEs provide access, in each TTI, select two or more UEs among the multiple UEs for each remaining RB resource, and the two or more UEs access the RB resource based on contention announcement of.
上述接收单元还用于,接收来自所述RN的两个UE基于竞争的方式接入一个剩余的RB资源的通知。The receiving unit is further configured to receive a notification from the RN that two UEs access a remaining RB resource based on contention.
本领域技术人员应当理解,上述的接收单元是为优化本发明的接入装置的技术方案而设置的,并非是实现本发明接入装置基本技术方案所必需的技术特征。Those skilled in the art should understand that the above-mentioned receiving unit is set up to optimize the technical solution of the access device of the present invention, and is not a necessary technical feature to realize the basic technical solution of the access device of the present invention.
上述第二确定单元31还用于以下述方式确定接入所述RN及所述宿主基站的接入概率:The above-mentioned second determination unit 31 is further configured to determine the access probability of accessing the RN and the donor base station in the following manner:
假设UEi的接入策略为:UEi的收益Vi以当前TTI所允许的数据传输可达速率R表示;UEi选择接入策略si 1时始终获得收益为R=r;而选择接入策略Si 2时,如果对方选择相同接入策略,当优先级大于对方时获得收益为R=(1+m)r,其中m为选择RN接入获得的增益因子,0<m<1;当优先级小于对方时UE1不在当前TTI调度,收益为0,如果对方选择不同接入策略,获得收益R=(1+m)r;Assume that the access policy of UE i is: The revenue V i of UE i is represented by the achievable rate R of data transmission allowed by the current TTI; when UE i selects access strategy s i 1 , the revenue is always R=r; when selecting access strategy S i 2 , if the other party Choose the same access strategy, when the priority is higher than the other party, the gain is R=(1+m)r, where m is the gain factor obtained by selecting RN access, 0<m<1; when the priority is lower than the other party, UE 1 Not in the current TTI scheduling, the income is 0, if the other party chooses a different access strategy, the income R=(1+m)r;
确定满足下式的混合接入策略:Determine the hybrid access policy that satisfies the following formula:
其中,s1 *和s2 *为博弈的均衡接入策略;Among them, s 1 * and s 2 * are the equilibrium access strategies of the game;
根据不完全信息静态博弈模型的虚拟参与者对优先级进行概率选择,得到相应的博弈树;According to the virtual participants of the incomplete information static game model, the priority is selected by probability, and the corresponding game tree is obtained;
根据所述博弈树确定UE2的混合接入策略选择概率,为(p2,1-p2),则有下式:Determine the hybrid access strategy selection probability of UE2 according to the game tree, which is (p 2 , 1-p 2 ), then there is the following formula:
Max V2=P(K1>K2)[p1 *(p2*r+(1-p2)*(1+m)r)+(1-p1 *)(p2*r+(1-p2)*0)]+Max V 2 =P(K 1 >K 2 )[p 1 * (p 2 *r+(1-p 2 )*(1+m)r)+(1-p 1 * )(p 2 *r+(1 -p 2 )*0)]+
P(K1<K2)[p1 *(p2*r+(1-p2)*(1+m)r)+(1-p1 *)(p2*r+(1-p2)*(1+m)r)]P(K 1 <K 2 )[p 1 * (p 2 *r+(1-p 2 )*(1+m)r)+(1-p 1 * )(p 2 *r+(1-p 2 ) *(1+m)r)]
其中,(p1 *,1-p1 *)为U1的混合接入策略均衡解;Among them, (p 1 * , 1-p 1 * ) is U 1 's hybrid access strategy equilibrium solution;
假设UEi的优先级Ki为均匀分布,则(K1,K2)为联合二维均匀分布,则P(K1<K2)=P(K1>K2)=0.5;当p2取得均衡解时,有p1 *=p2 *=p*;且下式成立:Assuming that the priority K i of UE i is uniformly distributed, then (K 1 , K 2 ) is a joint two-dimensional uniform distribution, then P(K 1 <K 2 )=P(K 1 >K 2 )=0.5; when p 2 When the equilibrium solution is obtained, p 1 * =p 2 * =p * ; and the following formula holds:
V2(p2 *=p*)=V2(s2 2),即:V 2 (p 2 * = p * ) = V 2 (s 2 2 ), namely:
0.5[p*(p**r+(1-p*)*(1+m)r)+(1-p*)(p**r+(1-p*)*0)]+0.5[p * (p * *r+(1-p * )*(1+m)r)+(1-p * )(p * *r+(1-p * )*0)]+
0.5[p*(p**r+(1-p*)*(1+m)r)+(1-p*)(p**r+(1-p*)*(1+m)r)]=0.5[p * (p * *r+(1-p * )*(1+m)r)+(1-p * )(p * *r+(1-p * )*(1+m)r)] =
0.5(1+m)p**r+0.5(1+m)*r0.5(1+m)p * *r+0.5(1+m)*r
解得 Solutions have to
确定U1的混合接入策略均衡解为 Determine the hybrid access strategy equilibrium solution of U 1 as
以接入所述RN及所述宿主基站的混合接入策略均衡解分别作为接入所述RN及所述宿主基站的接入概率。The hybrid access policy equilibrium solution for accessing the RN and the donor base station is used as the access probability of accessing the RN and the donor base station respectively.
本领域技术人员应当理解,图3中所示的接入装置中的各处理单元的实现功能可参照前述接入方法的相关描述而理解。本领域技术人员应当理解,图3所示的接入装置中各处理单元的功能可通过运行于处理器上的程序而实现,也可通过具体的逻辑电路而实现。Those skilled in the art should understand that the functions implemented by each processing unit in the access device shown in FIG. 3 can be understood with reference to the relevant description of the aforementioned access method. Those skilled in the art should understand that the functions of each processing unit in the access device shown in FIG. 3 may be implemented by a program running on a processor, or may be implemented by a specific logic circuit.
本发明还记载了一种用户设备,包括前述图3所示的接入装置。The present invention also records a user equipment, including the aforementioned access device shown in FIG. 3 .
以上所述,仅为本发明的较佳实施例而已,并非用于限定本发明的保护范围。The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention.
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