CN103686931B - A kind of cut-in method and device, user equipment - Google Patents

Abstract

The invention discloses a kind of cut-in method, including：When user equipment (UE) determines that the difference of the receiving power of via node RN signals and the receiving power of host base station signal is in setting range, the access strategy of the access strategy and the access host base station that access the RN according to the UE determines that the UE accesses the access probability of the RN and the host base station respectively, and the access of the UE is performed with identified access probability.The present invention discloses a kind of access device and user equipment.The present invention can reduce the negative effect that backhaul link bottlenecks bring by the strategy based on game, and system throughput flow gain is ensure that to a certain extent, while also ensure that the fairness that UE is accessed.

Description

An access method and device, and user equipment

technical field

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.

Background technique

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.

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.

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.

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.

Contents of the invention

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.

In order to achieve the above object, technical solution of the present invention is achieved in that way:

An access method, the method comprising:

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.

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:

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.

Preferably, the method also includes:

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.

Preferably, the method also includes:

The RN notifies two UEs to access a remaining RB resource based on contention.

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:

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;

Determine the hybrid access policy that satisfies the following formula:

Among them, s ₁ ^* and s ₂ ^* are the equilibrium access strategies of the game;

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;

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 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)]

Among them, (p ₁ ^* , 1-p ₁ ^* ) is U ₁ 's hybrid access strategy equilibrium solution;

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:

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 ^* )*(1+m)r)] =

0.5(1+m)p ^* *r+0.5(1+m)*r

Solutions have to

Determine the hybrid access strategy equilibrium solution of U ₁ as

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.

An access device, the device comprising a first determination unit, a second determination unit, and an execution unit, wherein:

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;

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;

An executing unit, configured to execute access with the determined access probability.

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.

Preferably, the device also includes:

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.

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.

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:

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;

Determine the hybrid access policy that satisfies the following formula:

Among them, s ₁ ^* and s ₂ ^* are the equilibrium access strategies of the game;

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;

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 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)]

Among them, (p ₁ ^* , 1-p ₁ ^* ) is U ₁ 's hybrid access strategy equilibrium solution;

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:

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 ^* )*(1+m)r)] =

0.5(1+m)p ^* *r+0.5(1+m)*r

Solutions have to

Determine the hybrid access strategy equilibrium solution of U ₁ as

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.

A user equipment includes the aforementioned access device.

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.

Description of drawings

FIG. 1 is a flowchart of an access method according to an embodiment of the present invention;

2 is a schematic structural diagram of a revenue game tree of an access model according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of the composition and structure of an access device according to an embodiment of the present invention.

detailed description

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.

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.

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:

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.

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.

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.

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.

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 ).

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.

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:

Among them, s ₁ ^* and s ₂ ^* are the equilibrium access strategies of the game.

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.

Assuming that the hybrid access strategy selection probability of UE ₂ is (p ₂ , 1-p ₂ ), then

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)]

Where (p ₁ ^* , 1-p ₁ ^* ) is the hybrid access policy equilibrium solution of UE ₁ .

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:

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 ^* )*(1+m)r)] =

0.5(1+m)p ^* *r+0.5(1+m)*r

Solutions have to

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.

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.

UE ₁ with The probability of choosing to access the donor base station, with The probability of is selected by accessing the RN.

Equilibrium solution in hybrid access strategy Under the access strategy of , examine the user income, and get

V _i = r, i = 1, 2

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.

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.

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:

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;

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;

The executing unit 32 is configured to execute access with the determined access probability.

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.

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.

The receiving unit is further configured to receive a notification from the RN that two UEs access a remaining RB resource based on contention.

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.

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:

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;

Determine the hybrid access policy that satisfies the following formula:

Among them, s ₁ ^* and s ₂ ^* are the equilibrium access strategies of the game;

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;

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 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)]

Among them, (p ₁ ^* , 1-p ₁ ^* ) is U ₁ 's hybrid access strategy equilibrium solution;

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:

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 ^* )*(1+m)r)] =

0.5(1+m)p ^* *r+0.5(1+m)*r

Solutions have to

Determine the hybrid access strategy equilibrium solution of U ₁ as

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.

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.

The present invention also records a user equipment, including the aforementioned access device shown in FIG. 3 .

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention.

Claims (11)

1. An access method, characterized in that the method comprises: When the user equipment UE determines that the difference between the received power of the relay node RN signal and the received power of the signal of the donor base station is within a set range, in the coverage edge area of the donor base station and the RN cell, according to the UE accessing the The access strategy of the RN and the access strategy for accessing the donor base station respectively determine the access probability of the UE to access the RN and the donor base station through a game behavior, and execute the procedure with the determined access probability. access of the UE. 2. The method according to claim 1, wherein 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, comprising: 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. 3. The method according to claim 1 or 2, characterized in that the method further comprises: 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. 4. method according to claim 3, is characterized in that, described method also comprises: The RN notifies two UEs to access a remaining RB resource based on contention. 5. The method according to claim 4, wherein, according to the access strategy of the UE for accessing the RN and the access strategy for accessing the donor base station, it is determined that the UE accesses the The access probability of the RN and the donor base station includes: 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; Determine the hybrid access policy that satisfies the following formula: ${\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; \&Element;</span>\mathrm{<span\; class="notranslate">\; arg</span>}\underset{{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; x</span>}}{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}^{<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; )</span>$ ${\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}^{<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; \&Element;</span>\mathrm{<span\; class="notranslate">\; arg</span>}\underset{{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; x</span>}}{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>$ Among them, s ₁ ^* and s ₂ ^* are the equilibrium access strategies of the game; 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; 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 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)] Among them, (p ₁ ^* , 1-p ₁ ^* ) is U ₁ 's hybrid access strategy equilibrium solution; 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 When the equilibrium solution is obtained, p ₁ ^* ＝p ₂ ^* ＝p ^* ; and the following formula holds: 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 ^* )*(1+m)r)] = 0.5(1+m)p ^* *r+0.5(1+m)*r Solutions have to Determine the hybrid access strategy equilibrium solution of U ₁ as 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. 6. An access device, characterized in that the device comprises a first determination unit, a second determination unit and an execution unit, wherein: 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; The second determination unit is configured to respectively determine the access in the coverage edge area of the donor base station and the RN cell according to the access strategy for accessing the RN and the access strategy for accessing the donor base station through a game behavior The access probability of the RN and the donor base station; An executing unit, configured to execute access with the determined access probability. 7. The device according to claim 6, wherein the first determination 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 When the difference between the received power and the received power of the donor base station signal is less than or equal to a 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. 8. The device according to claim 6 or 7, wherein the device further comprises: 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. 9 . The device according to claim 8 , wherein the receiving unit is further configured to receive a notification from the RN that two UEs access a remaining RB resource in a contention-based manner. 10. The device according to claim 9, wherein the second determination unit is further configured to determine the access probability of accessing the RN and the donor base station in the following manner: 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; Determine the hybrid access policy that satisfies the following formula: ${\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; \&Element;</span>\mathrm{<span\; class="notranslate">\; arg</span>}\underset{{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; x</span>}}{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}^{<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; )</span>$ ${\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}^{<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; \&Element;</span>\mathrm{<span\; class="notranslate">\; arg</span>}\underset{{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; x</span>}}{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>$ Among them, s ₁ ^* and s ₂ ^* are the equilibrium access strategies of the game; 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; 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 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)] Among them, (p ₁ ^* , 1-p ₁ ^* ) is U ₁ 's hybrid access strategy equilibrium solution; 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 When the access strategy equilibrium solution is obtained, p ₁ ^* ＝p ₂ ^* ＝p ^* ; and the following formula holds: 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 ^* )*(1+m)r)] = 0.5(1+m)p ^* *r+0.5(1+m)*r Solutions have to Determine the hybrid access strategy equilibrium solution of U ₁ as 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. 11. A user equipment, characterized in that the user equipment comprises the access apparatus according to any one of claims 6 to 9.