WO2010045792A1

WO2010045792A1 - Mixed relay method and base station and relay station thereof for realizing the method

Info

Publication number: WO2010045792A1
Application number: PCT/CN2009/070493
Authority: WO
Inventors: 杨瑾; 赵楠; 李峰; 朱常青; 梁枫; 张学林
Original assignee: 中兴通讯股份有限公司
Priority date: 2008-10-23
Filing date: 2009-02-20
Publication date: 2010-04-29
Also published as: CN101729121A

Abstract

A mixed relay method and Base Station and Relay Station thereof for realizing the method are applied to a mobile communication system comprising a Relay Station, the method includes: a Base Station or a Relay Station determines the relay mode used for the signal to be relayed according to the set relay mode determination algorithm and the information related to the relay mode determination of the signal to be relayed; the Relay Station performs reproduction relay forwarding or non-reproduction relay forwarding for the received signal to be relayed according to the determined relay mode. The present invention also provides the Base Station and the Relay Station for realizing the mixed relay method. Using the present invention can adapt to different signal requests and realize the relay forwarding for the signal in an appropriate relay mode.

Description

Hybrid relay method and base station and relay station implementing the same

Technical field

The present invention relates to a mobile communication system including a relay station (RS: Relay Station), and more particularly to a method for implementing relay, and a base station and a relay station implementing the method.

Background technique

The development of mobile communications requires support for higher transmission rates, better signal coverage, and higher resource utilization. On the one hand, in order to achieve a high transmission rate, the communication system will transmit signals with higher frequency bands, and on the other hand, higher frequencies will bring greater path loss and affect network coverage. Relay technology is proposed to effectively improve network coverage, improve network capacity and resource utilization. Therefore, relay technology is regarded as a key technology of 4G (fourth generation mobile communication technology).

In the relay communication system, the user equipment (UE: User Equipment) has two ways to connect with the base station (BS: Base Station), one is the direct communication method in the traditional communication network, and the other is the relay month through the RS. Good service to achieve communication between the UE and the BS.

Depending on how the signals are relayed, the relay mode can be divided into regenerative relays and non-regenerative relays.

The regenerative relay mode means that the relay station demodulates (or demodulates and decodes) the received signal to filter out interference caused by the propagation process, and then performs corresponding modulation (or coding and modulation) to perform the signal. Relay forwarding. Therefore, the regenerative relay method can filter the interference introduced in the signal transmission during the relay process, but at the same time, the correlation processing introduces a certain delay.

The non-regenerative relay mode means that the relay station forwards the signal in a manner that directly amplifies and forwards the signal when the relay station performs relaying and forwarding of the signal, and does not demodulate or decode the signal, but may include a fast Fourier transform (Fast). Fourier Transform (abbreviated as FFT), deinterleaving, reinterleaving, and FFT processing. Therefore, the non-regenerative relay method amplifies and forwards the interference signal brought by the signal during the propagation process together with the useful signal, and the interference signal is also Passed to the lower node, but because the non-regenerative relay does not need to further process the signal, there is basically no delay in relaying the signal. In the current discussion about relays, the regenerative relay mode or the non-regenerative relay mode is generally divided into two independent relay methods, which are applied to different network scenario requirements. The non-regenerative relay mode can be applied to cover scenes such as network blind spots in the cell, and directly amplify and forward the base station signal to the blind spot area, so that the blind spot area UE can receive the relayed signal and achieve seamless coverage of the network. The advantage of using the non-regenerative relay method is that the implementation is simple, the network setup requirements are low, and the cost is low, but the interference signal in the signal is not suppressed and eliminated, and there is no gain effect on the resource utilization and capacity of the cell.

The regenerative relay method can be applied to an environment with high user density to improve signal propagation quality and cell capacity through relay services. In this case, the UE receiving the relay service receives the signal that is relayed and regenerated, and the signal is filtered and reproduced by the interference, thereby improving the signal quality, and effectively improving the resource utilization and capacity of the cell, but regenerating. The relay mode is not applicable to services that require high real-time performance, such as Voice over Internet Protocol (VoIP) services. For the service with high real-time requirements, the processing delay of the regenerative relay mode cannot be tolerated. Therefore, in the current application scenario using the regenerative relay mode, the network is improved to improve resource utilization, cell capacity, and the like. Demand, but in the face of high real-time requirements, the regenerative relay method cannot be applied.

Under the coverage of the relay station, the UE that receives the regenerative relay mode service has high delay requirements and meets the delay guarantee for providing high quality signals to the UE and services required for high real-time performance.

In addition, due to factors such as the location of the relay station, the link conditions between the base station-relay station and the relay station-UE are different, and the signal that the relay station forwards to the UE (also referred to as the terminal or user terminal) and the signal quality forwarded to the base station are required. There is a big difference. If the uplink and downlink signals to be relayed are used in a unified manner, the regenerative relay mode may cause problems such as large delay and low resource utilization. However, the unified use of non-regenerative relay mode cannot provide better. Forward signal quality.

Summary of the invention

The technical problem to be solved by the present invention is to propose a hybrid relay method, which can adapt to different signal requirements and implement signal relay forwarding in an appropriate relay manner.

In order to solve the above technical problem, the present invention provides a hybrid relay method, which is applied to A mobile communication system of a relay station, the method comprising:

The base station or the relay station determines, according to the set relay mode decision algorithm and the information related to the relay mode decision of the signal to be relayed, the relay mode used for the signal to be relayed;

The relay station performs regenerative relay forwarding or non-regeneration relay forwarding on the received relay to be relayed signal according to the determined relay mode.

Further, the hybrid relay method may further have the following features: the determining of the relay mode is performed by the base station, and the method is further divided into the following steps:

The relay station reports at least part of the information related to the relay mode decision of the to-be-relayed signal to the base station;

Determining, by the base station, a relay mode for the to-be-relayed signal and notifying the relay station according to the set relay mode decision algorithm and the information about the to-be-relayed signal and the relay mode decision; The relay station performs regenerative relay forwarding or non-regenerative relay forwarding according to the determined relay mode.

Further, the hybrid relay method may further have the following features: the determining of the relay mode is performed at the relay station, and the method is further divided into the following steps:

After obtaining the information related to the relay mode decision of the to-be-relay signal, the relay station determines a relay mode for using the to-be-relayed signal according to the set relay mode decision algorithm;

And the relay station performs regenerative relay forwarding or non-regenerative relay forwarding according to the determined relay mode.

Further, the above hybrid relay method may also have the following features:

The relay station relays the regenerative relay mode or the non-regenerative relay mode configured by the system to be relayed on the system designated resource.

Further, the above hybrid relay method may also have the following features:

The signal to be relayed on the specified resource of the system includes a signal of a periodic system broadcast message, and the signal of the relay system broadcast message of the periodic system is fixed and relayed by a non-regenerative relay mode. Further, the above hybrid relay method may also have the following features:

The information about the to-be-relay signal and the relay mode decision includes one or more of the following information: a service type of the service to which the to-be-relayed signal belongs, a QoS requirement of the to-be-relayed signal, and a channel quality, a buffer status of a relay station to be relayed by the relay signal, and a fairness requirement of resource allocation; the channel quality includes one or more of the following channel qualities: quality of a channel between the relay station and the base station And a quality of a channel between the relay station and a user equipment to which the signal to be relayed belongs, and a quality of a channel between the relay station and another relay station.

Further, the above hybrid relay method may also have the following features:

The information related to the relay mode decision reported by the relay station to the base station includes one or more of the following information: quality information of a channel between the relay station and the base station, the relay station and the waiting station The quality information of the channel between the user equipments to which the signal belongs, the quality information of the channel between the relay station and other relay stations, and the buffer status information of the relay station.

Further, the above hybrid relay method may also have the following features:

When the relay mode is determined, the uplink signal and the downlink signal of the same user equipment are respectively determined; and/or, when the relay mode is determined, the signals of different services of the same user equipment are respectively determined.

Further, the foregoing hybrid relay method may further have the following features: The set relay mode decision algorithm includes:

If the non-regenerative relay mode can meet the QoS requirements of the signal to be relayed, the non-regenerative relay mode is preferred.

If only the regenerative relay method is used to satisfy the QoS requirements of the signal to be relayed, and the relay station has sufficient resources available, it is determined that the regenerative relay mode is used.

The above hybrid relay method can combine the signal quality improvement brought by the regenerative relay and the small transmission delay caused by the non-regenerative relay, thereby improving the applicability and flexibility of the relay station, and improving the system performance and the user experience. In an embodiment of the present invention, the current channel condition and the QoS requirement for the signal can be effectively utilized, and the function of improving the quality of the relay signal, such as reducing the bit error rate and ensuring the delay requirement, can be achieved as much as possible. In other embodiments of the present invention, the fairness of the distribution of the guaranteed resources can also be achieved. High resource utilization and other effects.

Another technical problem to be solved by the present invention is to provide a relay station for implementing a hybrid relay method.

In order to solve the technical problem, the present invention provides a relay station for implementing a hybrid relay method, including a signal receiving module, a regenerative relay processing mode processing module, and further includes an information collecting and reporting module, a decision result receiving module, and non-regeneration. Relay mode processing module, where:

And the information collection and upper module is configured to collect at least part of information related to the relay mode decision and the relay mode decision, and uplink the base station;

The decision result receiving module is configured to receive a relay mode decision result of the to-be-relayed signal from the base station, and record, and determine, according to the decision result, a relay for the to-be-relayed signal the way;

The signal receiving and distributing module is configured to receive the to-be-relayed signal, and distribute the to-be-relayed signal to the regeneration according to a relay mode determined by the determination result receiving module for the to-be-relayed signal Following the mode processing module or the non-regenerative relay mode processing module;

The regenerative relay mode processing module is configured to perform retransmission relaying on the to-be-relayed signal distributed to the module;

The non-regenerative relay mode processing module is configured to perform non-regenerative relay forwarding on the to-be-relayed signal distributed to the module.

Further, the above relay station may also have the following features:

At least part of the information reported by the information collecting module includes one or more of the following information: quality information of a channel between the relay station and the base station, and a channel between the relay station and the UE to which the signal to be relayed belongs Quality information, quality information of a channel between the relay station and other relay stations, and buffer status information of the relay station;

Further, the above relay station may also have the following features:

The decision result receiving module is further configured to: perform relay forwarding on the to-be-relay signal on the designated resource according to the system configuration information, and perform relay forwarding on the non-regenerative relay mode; wherein the periodic system broadcasts the message signal , fixed and non-regenerative relay mode for relay forwarding. In order to solve the technical problem, the present invention further provides a relay station for implementing a hybrid relay method, including a signal receiving module, a regenerative relay processing mode processing module, and an information collecting module, a relay mode determining module, and a non-regeneration Relay mode processing module, where:

The information collecting module is configured to collect information related to the relay mode decision and the relay mode decision, and transmit the information to the relay mode decision module;

The relay mode determining module is configured to determine, according to the set relay mode decision algorithm and the information related to the relay mode decision collected by the information collecting module, to determine a relay mode for using the to-be-relayed signal ;

The signal receiving and distributing module is configured to receive the to-be-relayed signal, and distribute the to-be-relayed signal to the relay according to a relay mode determined by the relay mode determining module for the to-be-relayed signal Relay mode processing module or non-regenerative relay mode processing module;

Further, the above relay station may also have the following features:

The relay mode decision module is further configured to perform relay forwarding on the to-be-relayed signal on the designated resource according to the system configuration information, where the relaying mode is used for the periodic system broadcast message; The signal is fixed and relayed by non-regenerative relay.

Further, the above relay station may also have the following features:

The information related to the relay mode decision by the relay mode decision module for the relay mode decision includes one or more of the following information: a service type of the service to which the to-be-relayed signal belongs, the to-be-relay The QoS requirement of the signal, the channel quality, the buffer status of the relay station that relays the signal to be relayed, and the fairness requirement of resource allocation; the channel quality includes one or more of the following channel qualities: a quality of a channel between the relay station and the base station, a quality of a channel between the relay station and a UE to which the signal to be relayed belongs, and a quality of a channel between the relay station and other relay stations. Further, the above relay station may also have the following features:

The relay mode decision algorithm according to the set by the relay mode decision module includes: if the non-regenerative relay mode can meet the QoS requirement of the signal to be relayed, the non-regenerative relay mode is preferentially used; When the regenerative relay method is used to meet the QoS requirements of the signal to be relayed, and the relay station has sufficient resources available, it is determined that the regenerative relay mode is used.

The foregoing relay station can be used to implement the hybrid relay method described above, and according to the relay mode decision result, combined with the signal quality improvement brought by the regenerative relay and the small transmission delay caused by the non-regenerative relay, adapt to different signal pairs. Different needs for delay and quality.

Another technical problem to be solved by the present invention is to provide a base station for implementing a hybrid relay method.

In order to solve the above technical problem, the present invention provides a base station for implementing a hybrid relay method, where the base station includes an information collection module, a relay mode decision module, and a relay mode decision result notification module; wherein: the information collection a module, configured to collect information related to a relay mode and a relay mode decision algorithm;

The relay mode determining module is configured to determine, according to the information related to the relay mode decision algorithm and the set relay mode decision algorithm obtained by the information collecting module, the relay mode of the to-be-relayed signal ;

The relay mode decision result notification module is configured to notify the corresponding relay station of the relay mode decision result.

Further, the foregoing base station may also have the following features:

The information related to the relay mode decision collected by the information collection module includes one or more of the following information: a service type of the service to which the to-be-relayed signal belongs, a QoS requirement of the to-be-relayed signal, a channel quality, a buffering state of the relay station to be relayed and a fairness requirement of resource allocation; the channel quality includes one or more of the following channel qualities: a channel between the relay station and the base station Quality, the quality of the channel between the relay station and the UE to which the signal to be relayed belongs, and the quality of the channel between the relay station and other relay stations. The foregoing base station can be used to implement the hybrid relay method described above, and adapt to different signal delays according to the result of the relay mode decision, combined with the signal quality improvement brought by the regenerative relay and the small transmission delay caused by the non-regenerative relay. And different needs of quality.

BRIEF abstract

1 is a flowchart of a hybrid relay method for a pair of UE downlink signals according to an embodiment of the present invention; FIG. 2 is a functional block diagram of a base station according to an embodiment of the present invention;

3 is a functional block diagram of a relay station according to an embodiment of the present invention;

4 is a flowchart of a hybrid relay method for UE uplink signals according to Embodiment 2 of the present invention; FIG. 5 is a functional block diagram of a relay station according to Embodiment 2 of the present invention;

FIG. 6 is a flowchart of relaying a system broadcast signal in Embodiment 3 of the present invention.

Preferred embodiment of the invention

The hybrid relay method of the present invention can be used for a relay system of two or more hops or more. The relay station performs the relay forwarding process on the received signal to be relayed according to the relay mode decision result, and the to-be-relay signal may be an uplink signal or a downlink signal; it may be a service data signal or a control information signal; It is a signal from a base station, UE or other relay station. Different services of the same UE may use different relay modes, and the uplink and downlink signals of the same UE may also use different relay modes.

The hybrid relaying method of the present invention will be described below with reference to specific embodiments, but these embodiments are merely illustrative of the hybrid relaying method of the present invention. The application scenarios and scope of the present invention are not limited to the embodiments.

Embodiment 1

In this embodiment, the base station determines the relay mode, and can be used in the case where the relay station does not have the ability to determine the relay mode.

Taking a two-hop system as an example, the specific implementation process of the hybrid relay method in the downlink direction of the two-hop system is as shown in FIG. 1 , and includes the following steps: Step 110: Channel quality information between the relay station and the relay station, and between the relay station and the UE receiving the relay service under the relay station, and the buffer status information of the relay station; the relay station reports the relay mode decision related to the relay mode The information may also be one or two of the above three types of information. For example, for a time division system, the quality of the channel between the base station and the relay station may also be measured by the base station, and the relay station is not required to report. In addition, if the decision is made only for the uplink signal relay forwarding, only the quality of the channel between the relay station and the UE may be reported, and only when the decision is made for the downlink signal relay forwarding, only the quality of the channel between the base station and the relay station may be reported. Of course, for the present invention, the reported information is not limited to these types, and may be other information related to the relay mode decision. The above information may be periodically reported by the relay station, or may be reported by the relay station after receiving the corresponding signaling of the base station, or may be reported in other manners, which is not limited by the present invention.

Step 120: The base station determines, according to the QoS (Quality of Service) requirement of the downlink signal to be relayed, the downlink channel quality reported by the relay station, and the buffer status of the relay station, according to a preset relay mode decision algorithm (also referred to as a relay mode decision method). And determining, by the relay station, a relay mode for the downlink signal of the UE; in an example, the relay station based on the hybrid relay method provides a relay forwarding service for the UE _A and the UE _B , and the base station may downlink according to the UE _A and the UE _B. The QoS requirements of the signal (including delay requirements, bit error rate requirements, etc.), and the channel quality reported by the relay station and the buffer status information of the relay station, determine the downlink signal relay mode of UE _A and UE _B.

It is assumed that the error rate requirement a of the downlink signal of the UE _{A is} higher than the error rate requirement b of the downlink signal of the UE _B , and the service of the downlink signal of the UE _A and the UE _B has low latency requirement, that is, the regenerative relay is used. The processing delay caused by the method does not exceed the delay requirements of UE _A and UE _B , and the non-regenerative relay mode can satisfy the error rate requirement of UE _B for the downlink signal, but cannot satisfy the downlink signal of UE _A. The bit error rate is required. In this case, if the available resources of the relay station are sufficient (such as the buffer space of the relay station, the time-frequency resource allocated by the base station for the relay station, etc.), it may be determined that the relay station uses the downlink signal for UE _A to be used for regeneration. Following the mode, the downlink signal of UE _B is used in a non-regenerative relay mode.

When the regenerative relay mode is used, more system resources are required than the non-regenerative relay mode. Therefore, it is necessary to consider the resource status of the relay station such as the buffer status. The following may occur: The base station or the relay station can determine that the regenerative relay mode can meet the requirements according to the type of service, channel conditions, and QoS. However, due to limited resources available to the relay station, the final decision result is non-use. Regeneration relay method. The above-mentioned decision algorithm of the present embodiment is also applicable to the second embodiment and other occasions where the relay mode decision is required.

Step 130: The base station sends a decision result of the relay mode to the relay station, where the relay station records a relay mode in which the UE downlink signal should be used.

The relay mode decision result can be sent to the relay station together with the user data, resource allocation information, and the like. Step 140: The relay station performs a regenerative relay forwarding or a non-regenerative relay forwarding according to the received relay mode of the UE downlink signal, which is to be relayed.

In the case of the above example, the relay station performs regenerative relay forwarding on the indication resource on the UE _A signal according to the decision result of the base station, and performs non-regenerative relay forwarding on the UE _B signal.

In the uplink direction, the relay station receives the uplink signal from the UE and forwards it to the base station, and the specific relay forwarding process is basically similar to the downlink. The relay station reports information such as the quality of the uplink channel and the state of the uplink channel between the relay station and the UE related to the relay mode decision to the base station, and the base station recombines with the quality of the uplink channel between the relay station, the QoS requirement of the uplink signal, and the allocation for the relay station. The time-frequency resource or the like performs a decision according to the set relay mode decision algorithm and notifies the relay station of the result, and the relay station performs regenerative relay forwarding or non-regenerative relay forwarding on the uplink signal of the UE according to the determined relay mode. The uplink signal and the downlink signal can use the same or different relay modes. When determining the relay mode of the uplink signal, the quality of the entire uplink channel between the base station and the UE may be considered, and only the quality of the uplink channel between the relay station and the UE may be considered; when the relay mode of the downlink signal is determined, Considering the quality of the entire downlink channel between the base station and the UE, it is also possible to consider only the quality of the downlink channel between the base station and the relay station.

According to the above method, the relay forwarding method used for the relay signal is determined by the relay mode decision algorithm. According to the result of the decision, the relay station may relay all the relay signals in the regenerative relay mode, or perform the amplifying and forwarding in the non-regenerative relay mode, or simultaneously receive the regenerative relay mode and the non-regenerative relay mode. The signal is that the partial signal is regenerated and relayed, and the other part is non-regenerative relayed.

When the base station determines the relay mode, the functional blocks of the base station and the relay station of the corresponding relay system are respectively shown in FIG. 2 and FIG. 3. As shown in FIG. 2, the relevant module of the base station includes: an information collection module, a relay mode decision module, and a relay mode decision result notification module;

An information collecting module, configured to collect information related to a relay mode decision, where the relay station reports partial information related to the to-be-relayed signal and the relay mode decision, and other information related to the relay mode decision . The specific content of this information can be found in the description in the above process.

The relay mode decision module is configured to combine the information obtained from the information collection module, and determine the relay mode of the relay signal according to the set relay mode decision algorithm; the specific decision algorithm can be described in the above process.

The decision result notification module is configured to notify the corresponding relay station of the relay mode decision result obtained from the relay mode decision module.

Figure 3 shows a functional block diagram of a relay station of the relay system. The related module includes an information collection and reporting module, a decision result receiving module, a signal receiving module, a regenerative relay processing mode processing module, and a non-regenerative relay mode processing module, where:

The information collection and the upper module are configured to collect at least part of information related to the relay mode decision and report the base station. The reported information may be one or more of information such as channel quality information of the channel between the station and the relay station, quality information of the channel between the relay station and the UE, and buffer status information of the relay station.

The decision result receiving module is configured to receive a relay mode decision result of the signal to be relayed from the base station and record, and determine a relay mode to be used for the signal to be relayed according to the decision result.

a signal receiving and distributing module, configured to receive a signal to be relayed, and distribute the to-be-relayed signal to a regenerative relay mode processing module according to a relay manner determined by the receiving result receiving module to use the to-be-retransmitted signal Or non-regenerative relay mode processing module for relay forwarding.

The regenerative relay mode processing module is configured to perform regenerative relay forwarding on the to-be-relayed signal distributed to the module.

The non-regenerative relay mode processing module is configured to perform non-regenerative relay forwarding on the to-be-relayed signal distributed to the module. There are structural and functional entities, so the relay station of the original regenerative relay mode can support this hybrid relay method through a certain software upgrade.

Embodiment 2

In this embodiment, a two-hop system is still taken as an example, and the relay station determines the relay mode, and the relay station needs to have the capability of relay mode decision.

As shown in Figure 4, in the upstream direction, the implementation of the hybrid relay mode is as follows:

Step 410: The relay station acquires information about a UE uplink signal to be relayed and a relay mode decision, such as a service type of the service, a quality of a channel between the relay station and the UE, and a buffer status of the relay station.

The relay station can measure channel conditions between the relay station and the UE, between the relay station and the base station periodically or according to signaling. The QoS requirements of the signal (including the requirements for delay and bit error rate) can be obtained according to the type of service. In this embodiment, the service is used as the decision granularity, and the service type information needs to be understood. However, it is not necessary to directly obtain the service type when performing the relay mode decision, and the QoS requirement can be obtained.

Step 420: The relay station determines, according to the QoS requirement corresponding to the service type, the quality information and the buffer status of the uplink channel between the relay station and the UE, and determines the relay used for the uplink signal of the UE according to the set relay mode decision algorithm. the way;

When the decision is made according to the relay mode decision algorithm, if the non-regenerative relay mode can meet the QoS requirements of the signal to be relayed, the non-regenerative relay mode is used preferentially; if only the regenerative relay mode is used, the system can be satisfied. Following the QoS requirements of the signal, and the relay station has sufficient resources (such as buffer space and time-frequency resources) to be available, it can be determined that the regenerative relay mode is used. If any of the relay methods cannot meet all the requirements of the signal QoS at the same time, comprehensive consideration is needed. For example, the required indicators are quantized and weighted, and then compared with the set threshold to be judged.

It is assumed that there are UE _A , UE _B and UE _C under the relay station under the relay station. According to the channel quality conditions between each UE and the relay station, the channel conditions between the relay station and UE _A and UE _B are better, and the non-regenerative relay mode is adopted. A good forwarding effect can be obtained. The channel conditions between the relay station and the UE _C are poor. The uplink signal received by the relay station to the UE _C has been significantly interfered. When the resources are sufficient, the regenerative relay forwarding mode is applied. The signal is decoded and re-encoded, and the interference is filtered and then forwarded to the base station. . Therefore, the verdict is correct. The UE _A and UE _B signals use a non-regenerative relay method, and the UE _C uses a regenerative relay method. According to this embodiment, different services of the same UE may be relayed by using different relay modes. For example, for service A of a certain UE, the uplink signal to be transmitted has a higher error rate, but the delay is not Sensitive, combined with the channel quality and other conditions, it is determined that the uplink signal of the service A of the UE is used in the regenerative relay mode. The service B of the UE belongs to a delay-sensitive service, such as VoIP. The relay station determines, according to the decision algorithm, that the uplink signal related to the service B is relayed by the non-regenerative relay mode.

The above decision algorithm of this embodiment is also applicable to the first embodiment and other occasions where a relay mode decision is required. However, when the base station and the relay station determine the signal relay mode in the first embodiment and the second embodiment, the decision condition and the decision algorithm may be different.

Step 430: The relay station performs relay forwarding on the received UE uplink signal to be relayed, according to the decision result of the UE uplink signal relay mode, using a regenerative relay or a non-regenerative relay mode.

The specific relay forwarding process in the downlink direction is basically similar to the uplink direction. The relay station collects information related to the relay mode decision of the downlink signal of the UE to be relayed, such as the quality information of the channel between the base station and the relay station, the service type information (or QoS) of the service to which the UE downlink signal belongs, and the cache of the relay station. Status, available time-frequency resources, etc. The relay station performs a decision according to the collected information and the set relay mode decision algorithm, and then relays the received UE downlink signal according to the determined relay mode.

When the relay station determines the relay mode, the functional block diagram of the corresponding relay station is as shown in FIG. 5, including the information collection module, the relay mode decision module, the signal receiving module, the regenerative relay processing mode processing module, and the non-regenerative relay mode processing. Module, where:

The information collection module is configured to collect information related to the relay mode decision and the relay mode decision, and transmit the information to the relay mode decision module. For details, refer to the description of the process.

The relay mode decision module is configured to determine, according to the set relay mode decision algorithm and the information related to the relay mode decision collected by the information collection module, to determine a relay mode to be used for the relay signal. The specific judgment method is described in the above description of the process. a signal receiving and distributing module, configured to receive a signal to be relayed, and distribute the to-be-relayed signal to a regenerative relay mode according to a relay manner determined by the relay mode determining module for the to-be-relayed signal Module or non-regenerative relay mode processing module.

The non-regenerative relay mode processing module is configured to perform non-regeneration relay forwarding on the to-be-relayed signal distributed to the module.

According to the method of the above two embodiments, an example in which a relay station performs hybrid relay forwarding when it is disposed at the edge of a cell is given below.

In a two-hop system, a relay station based on a hybrid relay method may be placed at a cell edge location to provide relay services for cell edge users. In this scenario, there may be better channel conditions between the relay station and its serving UE. In this case, the uplink signal sent by the UE can be used in the non-regenerative relay forwarding mode to obtain a good relay effect, which can be compared to the regenerative relay. Further save system resources. The downlink signal transmitted by the base station can be forwarded by the regenerative relay or the non-regenerative relay according to the conditions.

When the relay station performs the relay mode decision, in the uplink direction, the relay station combines the measured quality of the uplink channel between the relay station and the UE according to the QoS requirements of the signal to be relayed in the service area, such as the bit error rate requirement and the delay requirement. The information is determined according to the relay mode decision algorithm for non-regenerative relay forwarding of the uplink signal of the UE; in the downlink direction, the relay station according to the quality of the downlink channel between the base station and the relay station, the QoS requirement of the signal to be relayed, and the buffer status of the relay station And determining, by the relay mode decision algorithm, the regenerative relay mode for the downlink signal of the UE. According to the judgment result, the relay station performs non-regenerative relay forwarding on the received uplink signal of the UE, and performs regenerative relay forwarding on the downlink signal sent to the UE.

When the base station performs the relay mode decision, the relay station reports the measured quality of the channel between the relay station and the UE, and the channel quality between the base station and the relay station and the buffer status of the relay station are reported to the base station. In the uplink direction, the base station determines, according to the QoS requirement of the signal to be relayed and the quality of the uplink channel between the relay station and the UE, the non-regenerative relay forwarding of the uplink signal of the UE according to the relay mode decision algorithm; The quality of the downlink channel between the base station and the relay station, and the signal to be relayed The QoS requirement and the buffer status of the relay station determine the regenerative relay mode for the downlink signal of the UE according to the relay mode decision algorithm. According to the result of the decision, the relay station performs non-regenerative relay forwarding on the received uplink signal of the UE, and performs regenerative relay forwarding on the downlink signal sent to the UE.

Both of the above embodiments are exemplified by a two-hop system. The hybrid relay method of the present invention can also be used in a multi-hop relay system larger than two hops. In a system with more than two hops, the corresponding processing is basically the same as the two-hop system, but the signals to be relayed received by the relay station in the uplink and downlink directions may come from other relay stations, and the information related to the relay mode decision is The channel quality information between the relay station and the relay station may also be included, and the channel quality information according to the relay mode decision by the relay station may use the relay station and the upper relay station or the base station, and the channel between the relay station and the lower relay station or the UE Quality information. When the base station performs the relay mode decision, for a certain relay station, the quality information of the channel between the relay station and the lower relay station or the UE, and the quality information of the channel between the relay station and the upper relay station or the base station can be performed. When the subordinate relay station reports the channel quality information to the base station, it can pass through other relay stations.

It should be noted that the information and algorithms related to the relay mode decision given by the above two embodiments are only two examples. The present invention can have a wide variety of choices for information and algorithms specific to relay mode decisions. For example, the decision can be made in conjunction with the fairness requirements of resource allocation. The fairness requirement of the resource allocation refers to the need to consider the base station domain UE (the UE directly communicating with the base station) and the relay domain UE in the resource scheduling (receiving the relay service under the RS, and performing the relay forwarding with the base station through the RS) The resource allocation ratio of the communicating UE), that is, balancing the fairness of the resources obtained by the UEs in the two domains.

For the present invention, the information related to the relay mode decision may include, but is not limited to, one or more of the following: the service type of the service to which the signal to be relayed belongs, the QoS requirement of the signal to be relayed, and the channel Quality, the buffer status of the relay station that relays the signal to be relayed, and the fairness requirement of resource allocation (reflected as the time-frequency resource allocated to the relay station). The channel quality is one or more of the following channel qualities: the quality of the channel between the relay station and the base station, the quality of the channel between the relay station and the UE to which the signal to be relayed belongs, and the quality of the channel between the relay station and other relay stations. Embodiment 3

In this embodiment, the relay station performs relaying on the signals of certain resources set by the system in a regenerative relay mode or a non-regenerative relay mode according to the system configuration, and does not need to be judged by the relay decision algorithm.

The system can set the relay station to use the non-regenerative relay mode for relay forwarding on the signal on a specified resource. The system can also set the relay station to relay the signal on a specified resource using the regenerative relay mode. The system's indication of the specified resource in the fixed relay mode can be static, semi-static or dynamic. The relay station will perform regenerative relay forwarding or non-regenerative relay forwarding on the signals on these designated resources according to the system configuration information.

The following describes the periodic system broadcast message as an example. The system configures the periodic system broadcast message to be fixed and uses the non-regenerative relay mode for relay forwarding. The specific process of the relay station forwarding the broadcast message to the periodic system is shown in Figure 6. Show, including:

Step 610: The relay station based on the hybrid relay method obtains system configuration information, where the system includes information for relaying the periodic broadcast message by using the non-regenerative relay mode.

Step 620: The relay station periodically receives the system broadcast message, and performs non-regenerative relay forwarding on the periodic system broadcast message according to the system configuration, that is, the partial signal of the system broadcast message in the received signal is directly amplified and forwarded to the UE.

In this embodiment, the method for relaying and forwarding the signal on the certain resources in the regenerative relay mode or the non-regenerative relay mode is used in the embodiment, and may be applied to the first embodiment or the second embodiment simultaneously. In a multi-hop relay system larger than two hops.

When the present embodiment is applied to the relay station in the first embodiment or the second embodiment, the decision result receiving module in the relay station in the first embodiment is used, and the relay mode determining module in the relay station in the second embodiment is further configured to allocate resources according to the system configuration. The relay mode of the to-be-relayed signal is determined to be the regenerative relay mode and distributed to the regenerative relay mode processing module, or is determined to be a non-regeneration relay mode and distributed to the non-regeneration relay mode processing module.

The invention may be embodied in a variety of other embodiments without departing from the spirit and scope of the invention. All changes and modifications are intended to fall within the scope of the appended claims. Industrial Applicability The present invention can be applied to a mobile communication system including a relay station, adapting to different signal requirements, and implementing signal relaying in an appropriate relay manner.

Claims

Claim

A hybrid relay method applied to a mobile communication system including a relay station, the method comprising: determining, by the base station or the relay station, the information related to the relay mode decision algorithm and the relay mode decision according to the set relay mode decision algorithm a relay mode for the signal to be relayed;

The hybrid relay method according to claim 1, wherein the decision of the relay mode is performed by the base station, and the method is further divided into the following steps:

The hybrid relay method according to claim 1, wherein the decision of the relay mode is performed at the relay station, and the method is further divided into the following steps:

4. The hybrid relay method according to claim 1, 2 or 3, characterized in that

The relay station relays the regenerative relay mode or the non-regenerative relay mode configured by the system to be relayed by the system to be relayed, and broadcasts the message signal to the periodic system, and uses the non-regenerative relay The method is relayed.

5. The hybrid relay method according to claim 1, 2 or 3, characterized in that The information about the to-be-relay signal and the relay mode decision includes one or more of the following: a service type of the service to which the to-be-relayed signal belongs, a quality of service QoS requirement of the to-be-relayed signal, and a channel quality, a buffer status of the relay station that relays the signal to be relayed, and a fairness requirement of resource allocation; the channel quality includes one or more of the following channel qualities: a channel between the relay station and the base station Quality of the channel, the quality of the channel between the relay station and the user equipment to which the signal to be relayed belongs, and the quality of the channel between the relay station and other relay stations.

6. The hybrid relay method of claim 2, wherein

7. The hybrid relay method according to claim 1, 2 or 3, characterized in that

When the relay mode is determined, the signals of different user equipments, the uplink signals and downlink signals of the same user equipment, and the signals of different services of the same user equipment are respectively determined;

The set relay mode decision algorithm includes: if the non-regenerative relay mode can meet the QoS requirement of the signal to be relayed, the non-regenerative relay mode is used preferentially; if only the regenerative relay mode is used, the algorithm can be satisfied. If the QoS requirements of the signal to be relayed and the relay station have sufficient resources available, it is determined that the regenerative relay mode is used.

A relay station for a hybrid relay method, comprising a signal receiving module and a regenerative relay processing mode processing module, further comprising: an information collecting and reporting module, a decision result receiving module, and a non-regenerative relay mode processing module , among them:

And the at least part of the information about the to-be-relayed signal and the relay mode decision is reported to the base station, and the at least part of the reported information includes one or more of the following information: the relay station Quality information of a channel with the base station, quality information of a channel between the relay station and a user equipment to which the signal to be relayed belongs, quality information of a channel between the relay station and other relay stations, and buffer status information of the relay station ;

The decision result receiving module is configured to receive, by the base station, the signal to be relayed Determining and recording the result of the relay mode, and determining a relay mode for the signal to be relayed according to the result of the decision;

9. The relay station of claim 8 wherein:

The decision result receiving module is further configured to: perform relay forwarding on the to-be-relay signal on the designated resource according to the system configuration information, and perform relay forwarding on the non-regenerative relay mode; wherein the periodic system broadcasts the message signal , fixed and non-regenerative relay mode for relay forwarding.

A relay station for a hybrid relay method, comprising a signal receiving module and a regenerative relay processing mode processing module, further comprising: an information collecting module, a relay mode determining module, and a non-regenerative relay mode processing module, among them:

The non-regenerative relay mode processing module is configured to perform a signal to be relayed to be distributed to the module. Non-regenerative relay forwarding.

11. The relay station of claim 10, wherein:

12. The relay station of claim 10, wherein:

The information related to the relay mode decision by the relay mode decision module for the relay mode decision includes one or more of the following information: a service type of the service to which the to-be-relayed signal belongs, the to-be-relay The QoS requirement of the signal, the channel quality, the buffer status of the relay station that relays the signal to be relayed, and the fairness requirement of resource allocation; the channel quality includes one or more of the following channel qualities: a quality of a channel between the relay station and the base station, a quality of a channel between the relay station and a user equipment to which the signal to be relayed belongs, and a quality of a channel between the relay station and other relay stations.

13. A relay station according to claim 10 or 12, characterized in that:

The relay mode decision algorithm according to the set by the relay mode decision module includes: if the non-regenerative relay mode can meet the quality of service QoS requirement of the signal to be relayed, the non-regenerative relay mode is preferentially used; If only the regenerative relay mode is used to satisfy the QoS requirements of the signal to be relayed, and the relay station has sufficient resources available, it is determined that the regenerative relay mode is used.

A base station for a hybrid relay method, wherein the base station includes an information collection module, a relay mode decision module, and a relay mode decision result notification module;

The information collecting module is configured to collect information about a to-be-relay signal and a relay mode decision algorithm;

15. The base station of claim 14 wherein:

The information related to the relay mode decision collected by the information collection module includes one or more of the following information: a service type of the service to which the to-be-relayed signal belongs, a QoS requirement of the to-be-relayed signal, a channel quality, a buffering state of the relay station to be relayed and a fairness requirement of resource allocation; the channel quality includes one or more of the following channel qualities: a channel between the relay station and the base station Quality, the quality of the channel between the relay station and the user equipment to which the signal to be relayed belongs, and the quality of the channel between the relay station and other relay stations.