CN101568123B - Method and system for data carrying in relay system - Google Patents

Method and system for data carrying in relay system Download PDF

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Publication number
CN101568123B
CN101568123B CN2008101045818A CN200810104581A CN101568123B CN 101568123 B CN101568123 B CN 101568123B CN 2008101045818 A CN2008101045818 A CN 2008101045818A CN 200810104581 A CN200810104581 A CN 200810104581A CN 101568123 B CN101568123 B CN 101568123B
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access point
time
module unit
data
frequency module
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CN101568123A (en
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范斌
林懿诚
郑侃
王文博
廖文奇
韩璐
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China Mobile Communications Group Co Ltd
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China Mobile Communications Group Co Ltd
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Abstract

The invention discloses a method for data carrying in a relay system, which comprises the following steps that: access points, each two of which have an interference value smaller than a threshold value, in adjacent cells in the relay system are classified into the same access point group; time frequency resources are allocated to access point groups; and access points in the same access group usethe allocated same time frequency resource to carry respective data. The method greatly improves the effectiveness of system resources and increases system spectrum efficiency. The invention also dis closes a system for data carrying in the relay system.

Description

The method and system of carrying data in relay system
Technical field
The present invention relates to the data transmission technology of the communications field, relate in particular to a kind of method and system that in relay system, carries data.
Background technology
Development along with communication system, need each base station (Base Station, BS) can be travelling carriage (Mobile Station in larger scope, MS) provide service, but, because communication system, particularly future broadband wireless communication systems has high carrier frequency, and therefore independent base station can't be satisfied the requirement that covers on a large scale.In order to address this problem, under existing communication system (as cellular system) structure, increase relay station (Relay Station, RS), by utilizing the transfer of data (being the transfer of data of multi-hop mode) between relay station realization BS and the MS, under the condition that does not increase base station number, enlarge the coverage of system.Simultaneously, because do not need during by RS transmission data to consider and cable network between the access switched circuit, can reduce cost, therefore, utilize RS to realize that the technology (abbreviating the Relay technology as) of transfer of data has become the key technology in the next generation mobile communication.
In the cellular system that comprises a plurality of RS nodes, RS is generally half-duplex mode, be the RS node in transceive data on identical frequency band simultaneously sometime, therefore the data transmission period of whole RS node need be divided into two stages: input field (Access Zone) and relay domain (Relay Zone), wherein, at Access Zone, communicate between the MS of RS and BS node and its service; At Relay Zone, communicate between RS node and the BS.
Consider that the interference between link evades, different links need utilize different resources to carry data, therefore, need carry the link assignment resource of data on Access Zone and Relay Zone.As shown in Figure 1, a downlink frame is divided into Access Zone and Relay Zone on time domain, wherein: at Access Zone, the data of partial-band carrying BS → MS link, the data of residue frequency band carrying RS → MS link; At Relay Zone, the data of partial-band carrying BS → RS link, the data of residue frequency band carrying BS → MS link.
At the Access Zone shown in Fig. 1, for the frequency band of BS → MS link bearer data is wider than frequency band into RS → MS link bearer data, but may carry the data of the data of RS → MS link in the actual transmissions process more than carrying BS → MS link, this will cause for the frequency band of RS → MS link assignment not enough, and be not fully utilized for the frequency band of BS → MS link assignment simultaneously, cause the validity of communication system to reduce, the spectrum efficiency of system is lower.
Though in the IEEE802.16j system, proposed some resource dividing methods under the Relay technology, but all be to provide the method that the resource of carrying data link is divided from reducing the angle of disturbing, and the problem that the validity of not considering system resource reduces can not improve the spectrum efficiency of system effectively.
Summary of the invention
The embodiment of the invention provides a kind of method and system that carries data in relay system, to solve the problem of dividing the validity reduction that causes system resource owing to resource is fixing that exists in the prior art.
A kind of method of in relay system, carrying data, this method comprises:
With in the neighbor cell in the relay system between any two interference value be divided in the same access point group less than the access point of threshold value, access point is base station or relay station, wherein,
With in the neighbor cell between any two interference value be divided in the same access point group less than the access point of threshold value, comprise: allow each access point send data respectively, after receiving described data by remaining access point, the access point of determining to be in transmit status is to the interference value of the access point that is in accepting state, wherein at least one access point is the base station, the access point that is in accepting state reports described interference value to one of them base station, and described base station interference value between any two is divided in the same access point group less than the access point of threshold value;
Be described access point set of dispense running time-frequency resource;
The identical running time-frequency resource carrying data that belong to the access point utilization distribution of same access point group.
A kind of system of in relay system, carrying data, this system comprises:
The access point group is divided module, be used for in the relay system neighbor cell between any two interference value be divided in the same access point group less than the access point of threshold value, access point is base station or relay station, wherein, with in the neighbor cell between any two interference value be divided in the same access point group less than the access point of threshold value, comprise: allow each access point send data respectively, after receiving described data by remaining access point, the access point of determining to be in transmit status is to the interference value of the access point that is in accepting state, wherein at least one access point is the base station, the access point that is in accepting state reports described interference value to one of them base station, and described base station interference value between any two is divided in the same access point group less than the access point of threshold value;
Resource distribution module is used to described access point set of dispense running time-frequency resource;
Belong to the described access point in the same access point group, be used to utilize the identical running time-frequency resource carrying data of distribution.
The embodiment of the invention will disturb less access point to be divided into an access point group each other, regard an integral body as, for it distributes the running time-frequency resource of carrying data, follow-up when carrying out Data-carrying, each access point in the same access point group can utilize identical running time-frequency resource to carry data, improve the validity of system resource greatly, also improved the spectrum efficiency of system simultaneously.
Description of drawings
Fig. 1 is the structural representation of link divide resource in the background technology;
Fig. 2 is the method step schematic flow sheet of carrying data in the embodiment of the invention one;
Fig. 3 is the scene schematic diagram of resource division in the embodiment of the invention two;
Fig. 4 is a kind of structural representation to Access Zone resource division in the embodiment of the invention two;
Fig. 5 is an another kind of structural representation to Access Zone resource division in the embodiment of the invention two;
Fig. 6 is a kind of structural representation to Relay Zone resource division in the embodiment of the invention two;
Fig. 7 is an another kind of structural representation to Relay Zone resource division in the embodiment of the invention two;
Fig. 8 is a system configuration schematic diagram in the embodiment of the invention three.
Embodiment
Below in conjunction with Figure of description the embodiment of the invention is described in detail.
The embodiment of the invention one has proposed a kind of method of carrying data, and its method step schematic flow sheet may further comprise the steps as shown in Figure 2:
Step 201: measure the interference value between interior each access point of neighbor cell in the relay system, described access point is base station or relay station.
Know the disturbed condition of other access points in order to make the access point in each ofdm system to self, for the resource division of system provides foundation, guarantee effectively to disturb to evade, need measure the interference value between each access point in the netinit stage or in certain network operation stage.
Step 202: interference value is divided in the same access point group less than the access point of threshold value between any two.
Step 203: with the access point group is that base unit carries out resource allocation, all access points in this group use identical running time-frequency resource to receive or send data, the running time-frequency resource of the carrying data that relate in embodiments of the present invention can comprise one or more time-frequency module units, and this time-frequency module unit can be shown in Fig. 1 to be the Resource Block that coordinate constitutes with time domain and frequency domain.The time-frequency module unit can be continuous time-frequency resources, also can be the time-frequency resources that disperses.
Particularly, at Access Zone, when carrying out transfer of data between each access point (comprising BS and RS) in the same access point group and the MS, can use same time-frequency module unit carrying data; At RelayZone, each RS in the same access point group receives the data that data that BS issues can use same time-frequency module unit carrying to receive; The data that each BS in the same access point group can use same time-frequency module unit carrying to send to MS.
In the present embodiment, mobile station MS can be the multiple terminals that can get online without being tethered to a cable such as computer, PDA and mobile phone that can get online without being tethered to a cable.
By above three steps, system needn't carry out concrete division to the resource that different links uses, but utilize in same access point group the less principle of phase mutual interference between each access point, link in the same access point group is used identical running time-frequency resource carrying, improved usage factor of system resource effectively.
Below above three steps are elaborated respectively.
In step 201 and step 202, measuring the interference value between each access point and dividing the access point group to have several different methods, includes but not limited to following method:
The first step: determine each access point of a plurality of sub-districts adjacent in the system, and allow one in the access point outwards to send data, other access points receive described data, and the access point of determining to be in transmit status is to the interference value of the access point that receives data.
Particularly, can be that RS of BS control outwards sends data, and other RS and this BS be in accepting state, can guarantee that like this RS and the BS that are in accepting state can accurately measure the interference value of the RS of transmission data to self.
Second step: be in the interference value of the BS reporting measurement of access point in its sub-district of accepting state, obviously, this BS also determines and reports the interference value of access point to it.
The 3rd step: judge whether also to exist the access point that does not outwards send data,, then return the first step if exist; Otherwise, carried out for the 4th step.
The 4th step: the BS of reception interference value adds up the interference value between each access point and other access points, and will be between any two interference value be divided into same access point group less than the access point of threshold value, threshold value can be to set according to the link interference situation that system can tolerate.
For example: have these three access points of RS1, RS2 and RS3, interference value is less than threshold value between RS1 and the RS2, interference value is less than threshold value, if interference value then can be divided into an access point group with these three access points also less than threshold value between RS2 and the RS3 between RS1 and the RS3; Otherwise, RS1 and RS2 are divided into an access point group, perhaps RS1 and RS3 are divided into an access point group.
Because step 201 can be that the interference value of all access points in a plurality of sub-districts adjacent in the system is measured, according to access point each other interference value access point is divided, the division result who obtains is accurate, makes the implementation result of subsequent step better.
In step 203 resource of carrying data being carried out the branch timing can regard all RS in the same access point group as a RS and treat, therefore, in Access Zone, the data of (if having RS and BS in the access point group simultaneously) can be used identical time-frequency module unit carrying between RS → MS in the same access point group or between BS → MS link, and can not cause bigger interference, but, need consider to disturb the problem of evading when carrying out transfer of data between access point and the travelling carriage between the diverse access point group, so the data link in the diverse access point group needs different time-frequency module unit carryings.At Relay Zone, BS → RS the link of RS in the same access point group can use identical time-frequency module unit carrying data, BS → MS link can use other resources of removing among current area (or sector) the Relay Zone after BS → RS link assignment resource, further, at Relay zone, the BS → MS link that is in the same access point group can use identical time-frequency module unit carrying data.
In addition, can be dynamically each access point set of dispense time-frequency module unit for marking off, as can being the size of the time-frequency module unit of an access point set of dispense according to parameter adjustments such as transfer of data demand and/or channel quality in the current area.Illustrate, for access point group 1 is distributed time-frequency module unit 1 in Access Zone, for access point group 2 is distributed time-frequency module unit 2 in Access Zone, if the transfer of data increase in demand of the service of the access point in the current access point group 1, and the access point transfer of data demand in the access point group 2 reduces, then time-frequency module unit 1 is increased, and reduce time-frequency module unit 2.Particularly, the transfer of data demand can be determined according to the quantity and the type of service thereof of travelling carriage in the current area.
Realized goal of the invention of the present invention by above step, but in order to evade the utilance that improves resource under the condition of interference further, can be the time at least one time-frequency module unit of each access point set of dispense correspondence of marking off, also be that these time-frequency module units distribute priority, the data that need in the access point group to transmit are at first by the highest time-frequency module unit carrying of priority, when the highest time-frequency module unit of this priority is not enough to carry the data that need transmission, carry and send by priority time high time-frequency module unit after reducing transmitting power, by that analogy.Therefore, after determining the transmitting power that needs when utilizing time-frequency module unit carrying data, the transmitting power transmission data of the time-frequency module unit needs that can select according to access point, wherein: utilize different transmitting power transmission during the time-frequency module unit of different priorities carrying data, the transmitting power used of usury is high more more for priority.
Transmitting power can be determined by access point, also can be determined with the network entity that access point communicates by other.
Illustrate that below by the instantiation of embodiment two the present invention carries the method for data.
As shown in Figure 3, be the scene schematic diagram of three adjacent in the embodiment of the invention two sub-districts, each microzonation is divided into three sectors, and a BS is arranged in each sub-district, places a RS in each sector.The implementation step of present embodiment is as follows:
The first step: BS1 measures the interference value between each access point in three neighbor cells.
For example: the BS1 measurement is obtained BS1-BS3 and RS2-RS9 respectively to the interference value of RS1, measures and obtains BS1-BS3 and RS1, RS3-RS9 respectively to the interference value of RS2, by that analogy, obtains 9 RS and 3 BS interference value between any two.
In the present embodiment, if only have a BS, then utilizing this BS to obtain interference value, if there are a plurality of BS, then can be that among BS1, BS2 and the BS3 any one measured.
Second step: the BS1 is according to the interference value that obtains, and interference value between any two is divided into an access point group less than the access point of threshold value.
Can suppose from the scene graph of Fig. 3: RS1, RS4 and RS7 distance between any two are far away, and therefore interference each other is divided into the first access point group with these three access points less than threshold value; RS2, RS5 and RS8 are divided into the second access point group; RS3, RS6 and RS9 are divided into the 3rd access point group; BS1, BS2 and BS3 are divided into the 4th access point group.
The not necessarily above this mode of concrete dividing mode can be divided into more access point group, if in the access point group in twos the interference value between the access point just can less than threshold value.
The 3rd step: being the time-frequency module unit of at least one carrying data of each access point set of dispense, when distributing a plurality of time-frequency module unit, is that each time-frequency module unit is set a priority.
For example, as shown in Figure 4, at Access Zone, with sub-frame division is four time-frequency module units, the first time-frequency module unit and the second time-frequency module unit can be used to carry the data of link in the first access point group, wherein, the corresponding high priority of the first time-frequency module unit, the corresponding low priority of the second time-frequency module unit; The second time-frequency module unit and the 3rd time-frequency module unit can be used to carry the data of link in the second access point group, wherein: the corresponding high priority of the second time-frequency module unit, the corresponding low priority of the 3rd time-frequency module unit; The 3rd time-frequency module unit and the 4th time-frequency module unit can be used to carry the data of link in the 3rd access point group, wherein, and the corresponding high priority of the 3rd time-frequency module unit, the corresponding low priority of the 4th time-frequency module unit; The 4th time-frequency module unit and the first time-frequency module unit can be used to carry the data of link in the 4th access point group, wherein, and the corresponding high priority of the 4th time-frequency module unit, the corresponding low priority of the first time-frequency module unit.
Except resource division mode shown in Figure 4, also can carry out resource division to Access Zone according to mode shown in Figure 5.Certainly can also be that each access point group divides three or four time-frequency module units, allow the corresponding different priority of each time-frequency module unit; Perhaps, with the high priority time-frequency module unit of the part resource in the subframe as the access point group, surplus resources is as the low priority time-frequency module unit of access point group.
The principle of carrying out resource division at Relay Zone is the same with Access Zone, as shown in Figure 6, also be four time-frequency module units with frequency band division, the first time-frequency module unit on T1 to the T2 time domain and the second time-frequency module unit are distributed to BS → RS link in the first access point group, the corresponding high priority of this first time-frequency module unit, the corresponding low priority of the second time-frequency module unit is all distributed to BS → MS link in the first access point group with the second time-frequency module unit to the, four time-frequency module units on this time domain.Time-frequency module unit on T2 to the T3 time domain and the time-frequency module unit on T3 to the T4 time domain distribute also similar.
Except resource division mode as shown in Figure 6, can also be example with resource division on T1 to the T2 time domain, carry out resource division according to the mode of Fig. 7.
The 4th step: at first utilize the data of the interior link of time-frequency module unit carrying access point group of high priority correspondence, and utilize first transmitting power to transmit.
The 5th step: judge whether the time-frequency module unit of high priority correspondence enough carries the data of link in this access point group, if enough, then the Data-carrying process finishes in the present embodiment; Otherwise, utilize the time-frequency module unit of low priority correspondence to carry the data of link in this access point group, and utilize second transmitting power to transmit, wherein, first transmitting power is higher than second transmitting power.
For example: at Access Zone, when access point in the first access point group and MS transmission data, preferentially utilize first time-frequency module unit carrying data, and by bigger transmitting power transmission.In the first access point group, need data quantity transmitted bigger, when the first time-frequency module unit can't meet the demands, utilize second time-frequency module unit carrying data again, but, because the second time-frequency module unit is also simultaneously as the high priority time-frequency module unit of the second access point group, therefore in order to evade interference, need transmit by less transmitting power needs the data transmitted in the first access point group.In practical operation, in order to improve the performance of system, each access point can utilize first time-frequency module unit carrying data with distance MS transmission data far away the time, utilizes second time-frequency module unit carrying data during with the MS transmission data of close together.
At Relay Zone, preferentially utilize the data that the first time-frequency module unit carries BS in the first access point group → RS link on T1 to the T2 time domain, and by bigger transmitting power transmission.When this first time-frequency module unit is not enough to carry data, utilize the data of second time-frequency module unit carrying BS → RS link, but by less transmitting power transmission.Be that the first time-frequency module unit is the high priority resource of the first access point group on T1 to the T2 time domain, the second time-frequency module unit is its low priority resources.
By description to the inventive method, the embodiment of the invention three also provides a kind of system of carrying data in relay system, as shown in Figure 8, this system comprises that the access point group divides module 11, resource distribution module 12 and a plurality of access point 13, wherein: the access point group divide module 11 be used for in the relay system neighbor cell between any two interference value be divided in the same access point group less than the access point of threshold value; Resource distribution module 12 is used to described access point set of dispense running time-frequency resource; Described access point 13 belongs in the same access point group, is used to utilize distribute identical running time-frequency resource carrying data, and wherein: described access point 13 comprises base station and relay station.
It is access point set of dispense running time-frequency resource that described resource distribution module 12 is further used for according to current data transmission demand in the relay system overlay area and/or current channel quality.
Described system also comprises priority assignment module 14, is used for when described running time-frequency resource comprises a plurality of time-frequency module unit, is that the time-frequency module unit distributes priority, further, can be to be that each time-frequency module unit distributes priority.System also comprises power determination module 15, the transmitting power of needs when being used to determine to utilize time-frequency module unit carrying data, and wherein: the transmitting power that the time-frequency module unit that corresponding priority is high more needs is high more.
Described access point 13 is used for selecting time-frequency module unit carrying data successively according to priority order from high to low, and transmits data according to the transmitting power of the time-frequency module unit needs of selecting.
By the method and system that the embodiment of the invention provides, under the situation of consideration interference inhibition and system resource efficient access point and resource are divided at the same time, make the validity of system resource improve greatly, also improved the spectrum efficiency of system simultaneously; At the different transmitting power transmission data of the different utilizations of resources, guaranteed of the use of each access point for full range band resource, further improved resource utilization, improved systematic function; In addition, the present invention can be the time-frequency module unit size that the adjustment of access point group distributes adaptively, further improves the service efficiency of resource.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.

Claims (10)

  1. One kind in relay system the carrying data method, it is characterized in that this method comprises:
    With in the neighbor cell in the relay system between any two interference value be divided in the same access point group less than the access point of threshold value, access point is base station or relay station, wherein,
    With in the neighbor cell between any two interference value be divided in the same access point group less than the access point of threshold value, comprise: allow each access point send data respectively, after receiving described data by remaining access point, the access point of determining to be in transmit status is to the interference value of the access point that is in accepting state, wherein at least one access point is the base station, the access point that is in accepting state reports described interference value to one of them base station, and described base station interference value between any two is divided in the same access point group less than the access point of threshold value;
    Be described access point set of dispense running time-frequency resource;
    The identical running time-frequency resource carrying data that belong to the access point utilization distribution of same access point group.
  2. 2. the method for claim 1 is characterized in that, for the running time-frequency resource of described access point set of dispense is to determine according to current data transmission demand in the relay system overlay area and/or current channel quality.
  3. 3. the method for claim 1 is characterized in that, described running time-frequency resource comprises a plurality of time-frequency module units, and wherein, described time-frequency module unit has priority.
  4. 4. method as claimed in claim 3 is characterized in that, described method also comprises:
    The transmitting power that needs when determining to utilize time-frequency module unit carrying data, wherein: the transmitting power that the time-frequency module unit that priority is high more needs is high more.
  5. 5. method as claimed in claim 4 is characterized in that, the described access point that belongs to same access point group is selected time-frequency module unit carrying data successively according to priority order from high to low;
    Described method also further comprises:
    Transmitting power transmission data according to the time-frequency module unit needs of selecting.
  6. One kind in relay system the carrying data system, it is characterized in that this system comprises:
    The access point group is divided module, be used for in the relay system neighbor cell between any two interference value be divided in the same access point group less than the access point of threshold value, access point is base station or relay station, wherein, with in the neighbor cell between any two interference value be divided in the same access point group less than the access point of threshold value, comprise: allow each access point send data respectively, after receiving described data by remaining access point, the access point of determining to be in transmit status is to the interference value of the access point that is in accepting state, wherein at least one access point is the base station, the access point that is in accepting state reports described interference value to one of them base station, and described base station interference value between any two is divided in the same access point group less than the access point of threshold value;
    Resource distribution module is used to described access point set of dispense running time-frequency resource;
    Belong to the described access point in the same access point group, be used to utilize the identical running time-frequency resource carrying data of distribution.
  7. 7. system as claimed in claim 6 is characterized in that,
    Described resource distribution module, being used for according to current data transmission demand in the relay system overlay area and/or current channel quality is access point set of dispense running time-frequency resource.
  8. 8. system as claimed in claim 6 is characterized in that, described system also comprises:
    The priority assignment module is used for when described running time-frequency resource comprises a plurality of time-frequency module unit, is that the time-frequency module unit distributes priority.
  9. 9. system as claimed in claim 8 is characterized in that, described system also comprises:
    The power determination module, the transmitting power of needs when being used to determine to utilize time-frequency module unit carrying data, wherein: the transmitting power that the time-frequency module unit that priority is high more needs is high more.
  10. 10. system as claimed in claim 9 is characterized in that,
    Belong to the described access point in the same access point group, be used for selecting time-frequency module unit carrying data successively, and transmit data according to the transmitting power of the time-frequency module unit needs of selecting according to priority order from high to low.
CN2008101045818A 2008-04-21 2008-04-21 Method and system for data carrying in relay system Expired - Fee Related CN101568123B (en)

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