CN101282170A - Method for balancing load between principal and subordinate base stations of share relay system - Google Patents
Method for balancing load between principal and subordinate base stations of share relay system Download PDFInfo
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- CN101282170A CN101282170A CNA2007101005093A CN200710100509A CN101282170A CN 101282170 A CN101282170 A CN 101282170A CN A2007101005093 A CNA2007101005093 A CN A2007101005093A CN 200710100509 A CN200710100509 A CN 200710100509A CN 101282170 A CN101282170 A CN 101282170A
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Abstract
The present invention provides a method for balancing the load between an anchor base station and a subordinate base station. The method comprises the following steps: (a) transmitting information to the mobile station by the relay base station/relay station with the downlink access zone of the downlink subframe in the relay frame, transmitting information to the relay station by the selectable downlink relay zone of the downlink subframe, if the base station is busy, the selectable downlink reserving zone of the downlink subframe of the anchor base station and/or the subordinate base station is a selectable downlink chain access zone, and transmitting data to part mobile stations by the relay base station through the selectable downlink access zone; and (1) transmitting information to the relay base station/relay station by the mobile station with the uplink access zone of the uplink subframe in the relay frame, transmitting information to the relay base station/relay station by the relay station with the selectable uplink relay zone of the uplink subframe, if the base station is busy, the state of selectable uplink reserving zone of the anchor base station and/or the subordinate base station is the selectable uplink chain access zone, transmitting data to the base station by part mobile stations to the selectable uplink access zone.
Description
Technical field
The present invention relates in the communication field, relate in particular in mobile multi-hop relaying (MMR) system, the method for load balancing between the principal and subordinate base station in a kind of shared relay system.
Background technology
In the multihop relay system that IEEE 802.16j working group proposes, one or several RelayStations (RSs, relay station) is set at MR-Base Station (BS, multi-hop relay base station) and Mobile Stations (MSs, travelling carriage) between, MMR allocation plan as shown in Figure 1, signal transmission between BS and the MS is finished via one-level or several grades of relayings, by the continuous relaying of signal reach coverage expansion, eliminate blind spot, improve purposes such as service (referring to the baseline documents of IEEE 802.16j: 802.16j-06/026r2).According to baseline documents, relay system is divided into transparent relay system and nontransparent relay system.In multihop relay system, end-to-end transmission link is made of Access Link (access link) and Relay Link (repeated link), wherein, Access Link is initial or ends at the communication link of MS, Relay Link be defined as between MR-BS and the RS or two RSs between communication link.
Be illustrated in figure 2 as based on the double bounce relay system of sharing RS, promptly comprise the double bounce frame structure, wherein, described double bounce frame structure comprises a sub-frame of uplink and a descending sub frame, and each subframe comprises an Access Zone and an Optional Relay Zone again.User in sharing the RS area of coverage can communicate with master and slave base station respectively, covers to improve power system capacity and to enlarge, and its corresponding frame structure is (referring to pertinent literature C802.16j-07_006r1) as shown in Figure 3.
Frame structure shown in Figure 3 is corresponding to share (sharing) RS system (being characterized in that RS is positioned at the overlay region of two MR-BS coverages), and the principal and subordinate base station sends data in turn on shared RS.In even frame, dominant base anchor BS can use shared RS to carry out data and send, and realizes and the telex network of RS overlay area that frame structure comprises a descending sub frame, a sub-frame of uplink.Described descending sub frame comprises a DL Access Zone, a DL Relay Zone, and described sub-frame of uplink comprises a UL Access Zone, a UL Relay Zone.And do not communicate with RS from base station subordinate BS, this moment, frame structure comprised a descending sub frame, a sub-frame of uplink.Described descending sub frame comprises a DL Access Zone, and described sub-frame of uplink comprises a UL Access Zone.In odd-numbered frame, anchor BS and subordinate frame structure then just exchange.This frame structure utilization scheduling does not conflict the resource of RS, but has defective.
Because the MS in the RS area of coverage is always along with sharing communicate by letter with two BS (respectively on idol, the odd-numbered frame) that RS takes turns, can not be according to the loading condition of two base stations and the link communication quality situation between share RS and master and slave base station, carry out dynamic frame structure configuration, and then realize load balancing between the principal and subordinate base station.If promptly the situation that user in the RS overlay area has been close to overload appears in certain base station, shareRS can not play the effect of load balancing, is on the contrary to continue to give share RS Resources allocation in corresponding frame, and causes the user who has can not proper communication.
Summary of the invention
The technical problem to be solved in the present invention provides in a kind of shared relay system the method for load balancing between the principal and subordinate base station, with realize between different base station load balancing, improve communication quality.
In order to address the above problem, the present invention proposes in a kind of shared relay system the method for load balancing between the principal and subordinate base station, be applied to have master and slave at least two base stations, at least in the multi-hop relay network of a relay station of two common areas of coverage in base station and each at least one travelling carriage of base stations control, may further comprise the steps:
Down direction:
(a) relay base station/relay station utilizes the down link of the descending sub frame in the repeater frame to insert the district and sends information to travelling carriage, utilize the optional downlink relay district of descending sub frame to send information to relay station, if the base station is busy, dominant base and/or be that optional down link inserts the district then from the optional down link reserved area state of base station down subframe, at this moment, described relay base station inserts the district by described optional down link and sends data to the part travelling carriage.
Up direction:
(1) travelling carriage utilizes the up link of the sub-frame of uplink in the repeater frame to insert the district and sends information to relay base station/relay station, relay station utilizes the optional uplink relay area of sub-frame of uplink to send information to relay base station/relay station, if the base station is busy, dominant base and/or be that optional uplink inserts the district then from sub-frame of uplink optional uplink reserved area, base station state, at this moment, described part travelling carriage inserts the district by optional uplink and sends data to the base station;
Further, said method also can have following characteristics: in the step (a), down link inserts to be distinguished on the transmission time prior to optional downlink relay district and optional down link reserved area; In the step (1), up link inserts to be distinguished on the transmission time prior to optional uplink relay area and optional uplink reserved area.
Further, said method also can have following characteristics: in the step (a), if the base station free time, then optional down link reserved area state is idle, if the base station is busy, then described part travelling carriage and dominant base communicate by letter and from no co-channel interference between the communicating by letter of base station and relay station or co-channel interference value less than setting threshold; In the step (1), if the base station free time, then optional uplink reserved area state is idle; If the base station is busy, the communicating by letter of then described part travelling carriage and dominant base, relay station with from no co-channel interference between the communicating by letter of base station or co-channel interference value less than setting threshold.
Further, said method also can have following characteristics: in the step (a), if the base station free time, then optional down link reserved area state is idle, if the base station is busy, then described part travelling carriage and dominant base communicate by letter and from no co-channel interference between the communicating by letter of base station and relay station or co-channel interference value less than setting threshold; In the step (1), if the base station free time, then optional uplink reserved area state is idle; If the base station is busy, then described part travelling carriage with from the communicating by letter of base station, descending no co-channel interference or co-channel interference value are less than setting threshold between the communicating by letter of relay station and dominant base.
Further, said method also can have following characteristics: in the step (a), if dominant base is busy, then the optional down link of dominant base descending sub frame reserved area state is that optional down link inserts the district, perhaps dominant base and be that optional down link inserts the district from the optional down link of base station down subframe reserved area state; If busy from the base station, be that optional down link inserts the district then from the optional down link of base station down subframe reserved area state, perhaps dominant base and be that optional down link inserts the district from the optional down link of base station down subframe reserved area state; In the step (1), if dominant base is busy, then dominant base sub-frame of uplink optional uplink reserved area state is that optional uplink inserts the district, perhaps dominant base and be that optional uplink inserts the district from sub-frame of uplink optional uplink reserved area, base station state; If busy from the base station, be that optional uplink inserts the district then from sub-frame of uplink optional uplink reserved area, base station state, perhaps dominant base and be that optional uplink inserts the district from sub-frame of uplink optional uplink reserved area, base station state.
Further, said method also can have following characteristics: when scheduling of resource, optional descending/up link reserved area from the corresponding dominant base in optional descending/uplink relay district of base station, equally, optional descending/up link the reserved area of the corresponding dominant base in optional descending/uplink relay district of dominant base, if dominant base optional descending/up link district is simultaneously selected with the optional descending/up link district from the base station, then the two is strict time-multiplexed.
Further, said method also can have following characteristics: the descending sub frame in the step (a) on the transmission time prior to the sub-frame of uplink in the step (1).
Compared with prior art, the inventive method can be according to the link quality condition of loading condition and the master and slave base station and the shared RS of base station, utilize to share RS, dynamically adjust the corresponding RelayZone size of different B S, realize between different base station load balancing, improve communication quality.And the frame structure time delay that adopts in the inventive method is very little, and compatible existing IEEE802.16e frame structure can expand to the multi-hop frame structure, is applicable to multihop relay system.
Description of drawings
Fig. 1 is a wireless multi-hop relay network allocation plan in the prior art.
Fig. 2 is the network configuration figure that double bounce is shared RS in the prior art.
Fig. 3 is a double bounce frame assumption diagram of the prior art.
Fig. 4 is the double bounce frame structure among the embodiment.
Fig. 5 is that the anchor BS in the double bounce frame structure among the embodiment does not have resource to give the extreme frame structure situation of relay.
Fig. 6 is that the subordinate BS in the double bounce frame structure among the embodiment does not have resource to give the extreme frame structure situation of relay.
Embodiment
The difference of frame structure is to carry out the frame transmission configuration dynamically according to the loading condition of two base stations and the link quality condition of share RS and two base stations in the present invention and the prior art, thus realize between the different B S load balancing, improve communication quality.Fig. 4 is the frame assumption diagram based on a shared RS that provides among the embodiment, and the load extreme case has detailed explanation in Fig. 5 and Fig. 6.
Be described in further detail below in conjunction with the enforcement of drawings and Examples technical scheme.
Be illustrated in figure 4 as two base stations and in present frame, all need the situation of communicating by letter with shared RS.Described anchor BS and subordinate BS need consult to determine about the scheduling of resource situation of sharing RS according to the dynamic service load of two base stations and the link quality condition of share RS and master and slave base station, this consults to realize being undertaken by trunk backbone, not within the discussion scope of this patent.The frame structure of described anchor BS should comprise a descending sub frame and a sub-frame of uplink, and descending sub frame is before sub-frame of uplink.Described descending sub frame is used to realize that MR-BS to the purpose that RS/MS carries out transfer of data, is divided into a DL Access Zone, an Optional DL Relay Zone and an OptionalDL Reserve Zone.DL Access Zone is the essential part of descending sub frame, is used for MR-BS/RS and transmits to MS; Optional DL Relay Zone is the optional part of descending sub frame, is used for MR-BS/RS and transmits to RS; Optional DL Reserve Zone is an optionally part of descending sub frame, and is perhaps idle or carry out transfer of data to part MS.DL Access Zone on the transmission time prior to Optional DL Relay Zone and Optional DL Reserve Zone.
Described sub-frame of uplink is divided into a UL Access Zone, an Optional UL Relay Zone and an Optional UL Reserve Zone.UL Access Zone is the part of sub-frame of uplink, is used for MS and transmits to MR-BS/RS; Optional UL Relay Zone is the optional part of sub-frame of uplink, is used for RS and transmits to MR-BS/RS; Optional Reserve Zone is an optionally part of sub-frame of uplink, and is perhaps idle or carry out transfer of data by part MS to BS.No matter in the uplink and downlink direction, if the base station is idle relatively, then Optional DL/UL Reserve Zone state is idle (free time), if the base station is busy, then Optional DL/UL Reserve Zone state is Optional DL/ULAccess Zone.
The descending sub frame of described subordinate BS is divided into a DL Access Zone, an Optional DL Reserve Zone and an Optional DL Relay Zone.DL Access Zone is the essential part of descending sub frame, is used for MR-BS/RS and transmits to MS; Optional DLReserve Zone is an optionally part of descending sub frame, and is perhaps idle or carry out transfer of data by subordinate BS to part MS; Optional DL Relay Zone is the optional part of descending sub frame, is used for MR-BS/RS and transmits to RS.
Described sub-frame of uplink is divided into a UL Access Zone, an Optional Reserve Zone and an Optional UL Relay Zone.UL Access Zone is the part of sub-frame of uplink, is used for MS and transmits to MR-BS/RS; Optional UL Reserve Zone is an optionally part of sub-frame of uplink, and is perhaps idle or carry out transfer of data by part MS to subordiante BS; Optional UL RelayZone is the optional part of sub-frame of uplink, is used for RS and transmits to MR-BS/RS.The definition of OptionalDL/UL Reserve Zone is consistent with anchor BS.
Note during scheduling of resource subordinate BS Optional DL/UL Relay Zone correspondence be the Optional DL/UL Reserve Zone of anchor BS, if this moment, Optional DL/UL RelayZone did not select, then Optional DL/UL Reserve zone does not select in frame structure.Equally, the Optional DL/UL Relay Zone correspondence of anchorBS be the Optional DL/ULReserve Zone of anchor BS, if this moment, Optional DL/UL Relay Zone did not select, then Optional Reservezone does not select in anchor BS frame structure.If the Optional DL/UL Zone of the Optional DL/UL Zone of anchor BS and subordinate BS is simultaneously selected, the two is strict time-multiplexed.
Fig. 5 is an extreme case of the frame structure that provides of the present invention, and is busy from the base station, promptly the area of coverage intra domain user of sharing RS, all realizes and the communicating by letter of anchor BS by shared RS.This moment, the frame structure of described subordinate BS comprised a descending sub frame, a sub-frame of uplink; Described descending sub frame only comprises that first down link inserts district DL Access Zonel (A-DL1), second down link inserts district DL Access Zone2 (A-DL2, be DL Reserve zone), one first up link that only comprises described sub-frame of uplink inserts district UL Access Zone (A-UL1), second up link inserts district UL Access Zone2 (A-UL2, i.e. DL Reserve zone).The frame structure of described anchor BS comprises a descending sub frame, a sub-frame of uplink; Described descending sub frame only comprises DL Access Zone and a DL Relay Zone, and described sub-frame of uplink only comprises a UL Access Zone and UL Relay Zone.Distribute to MS in the subordinate BS overlay area by A-DL1 with subordinate BS, A-DL2 distributes to the part MS in the subordinate BS overlay area, the MS of this part is not for causing big co-channel interference with communicating by letter of share RS to anchor BS, and promptly descending no co-channel interference or co-channel interference value are less than setting threshold.How MS chooses not within the discussion scope of this patent, by sharing the problem that RS has solved subordinate BS overload, has realized the problem of load balancing of two base stations like this.
Fig. 6 is another extreme case of the frame structure that provides of the present invention, and dominant base is busy, promptly the user who shares in the RS overlay area, all realizes and the communicating by letter of subordinate BS by shared RS.This moment, the frame structure of described anchor BS comprised a descending sub frame, a sub-frame of uplink; Described descending sub frame only comprises that first down link inserts district DL Access Zone1 (A-DL1), second down link inserts district DL Access Zone2 (A-DL2), one first up link that only comprises described sub-frame of uplink inserts district UL Access Zone1 (A-UL1), and second up link inserts district UL Access Zone2 (A-UL2).The frame structure of described subordinate BS comprises a descending sub frame, a sub-frame of uplink; Described descending sub frame only comprises DL Access Zone and a DLRelay Zone, and described sub-frame of uplink only comprises a UL Access Zone and UL RelayZone.Distribute to MS in the anchor BS overlay area by A-DL1 with anchor BS, A-DL2 distributes to the part MS in the anchor BS overlay area, the MS of this part is not for causing big co-channel interference with communicating by letter of share RS to subordinateBS, and promptly descending no co-channel interference or co-channel interference value are less than setting threshold.How MS chooses not within the discussion scope of this patent, by sharing the problem that RS has solved anchor BS overload, has realized the problem of load balancing of two base stations like this.
The main distinction of the present invention and prior art: in the prior art share RS strange, even frame respectively with master and slave base station communication, share RS can not be in same frame simultaneously and two base station communications, user in all RS overlay areas takes turns and master and slave base station communication, and this does not just have the effect of load balancing.
The present invention is a kind of transmission means flexibly, can carry out the configuration of frame transmission dynamically according to the link quality condition of loading condition and principal and subordinate base station and shareRS, can carry out load balancing, improve communication quality.In order to realize flexibly communicating by letter between master and slave BS and the share RS, the present invention proposes a kind of new frame structure, this frame structure is not limited to the transmission mode (fixing communicates with principal and subordinate BS in turn) of the anchor-frame structure of the master and slave BS of prior art and shareRS, as long as guarantee the resource of communicating by letter in time of share RS and master and slave BS do not conflict just passable, thereby have very big flexibility.In addition, only relate among the embodiment based on the double bounce frame structure under the tdd mode, but the present invention can expand to multi-hop, and the double bounce relay frame structures that proposes is applicable under the nontransparent situation.
Be described in conjunction with specific embodiment although should be appreciated that the present invention, for a person skilled in the art, can under the situation that does not deviate from the spirit or scope of the present invention, make amendment and change.Any such modifications and variations are considered within scope of the present invention and additional claims scope.
Claims (7)
1. the method for load balancing between the principal and subordinate base station in the shared relay system, be applied to have master and slave at least two base stations, at least in the multi-hop relay network of a relay station of two common areas of coverage in base station and each at least one travelling carriage of base stations control, may further comprise the steps:
Down direction:
(a) relay base station/relay station utilizes the down link of the descending sub frame in the repeater frame to insert the district and sends information to travelling carriage, utilize the optional downlink relay district of descending sub frame to send information to relay station, if the base station is busy, dominant base and/or be that optional down link inserts the district then from the optional down link reserved area state of base station down subframe, at this moment, described relay base station inserts the district by described optional down link and sends data to the part travelling carriage.
Up direction:
(1) travelling carriage utilizes the up link of the sub-frame of uplink in the repeater frame to insert the district and sends information to relay base station/relay station, relay station utilizes the optional uplink relay area of sub-frame of uplink to send information to relay base station/relay station, if the base station is busy, dominant base and/or be that optional uplink inserts the district then from sub-frame of uplink optional uplink reserved area, base station state, at this moment, described part travelling carriage inserts the district by optional uplink and sends data to the base station;
2. method according to claim 1 is characterized in that:
In the step (a), down link inserts to be distinguished on the transmission time prior to optional downlink relay district and optional down link reserved area.
In the step (1), up link inserts to be distinguished on the transmission time prior to optional uplink relay area and optional uplink reserved area;
3. method according to claim 1 is characterized in that:
In the step (a), if the base station free time, then optional down link reserved area state is idle, if the base station is busy, then described part travelling carriage and dominant base communicate by letter and from no co-channel interference between the communicating by letter of base station and relay station or co-channel interference value less than setting threshold.
In the step (1), if the base station free time, then optional uplink reserved area state is idle; If the base station is busy, the communicating by letter of then described part travelling carriage and dominant base, relay station with from no co-channel interference between the communicating by letter of base station or co-channel interference value less than setting threshold;
4. method according to claim 1 is characterized in that:
In the step (a), if the base station free time, then optional down link reserved area state is idle, can realize not having the co-channel interference transmission; If the base station is busy, then described part travelling carriage and dominant base communicate by letter and from no co-channel interference between the communicating by letter of base station and relay station or co-channel interference value less than setting threshold.
In the step (1), if the base station free time, then optional uplink reserved area state is idle, can realize not having the co-channel interference transmission; If the base station is busy, then described part travelling carriage with from the communicating by letter of base station, descending no co-channel interference or co-channel interference value are less than setting threshold between the communicating by letter of relay station and dominant base;
5. method according to claim 1 is characterized in that:
In the step (a), if dominant base is busy, then the optional down link of dominant base descending sub frame reserved area state is that optional down link inserts the district, perhaps dominant base and be that optional down link inserts the district from the optional down link of base station down subframe reserved area state; If busy from the base station, be that optional down link inserts the district then from the optional down link of base station down subframe reserved area state, perhaps dominant base and be that optional down link inserts the district from the optional down link of base station down subframe reserved area state.
In the step (1), if dominant base is busy, then dominant base sub-frame of uplink optional uplink reserved area state is that optional uplink inserts the district, perhaps dominant base and be that optional uplink inserts the district from sub-frame of uplink optional uplink reserved area, base station state; If busy from the base station, be that optional uplink inserts the district then from sub-frame of uplink optional uplink reserved area, base station state, perhaps dominant base and be that optional uplink inserts the district from sub-frame of uplink optional uplink reserved area, base station state;
6. method according to claim 1 is characterized in that:
When scheduling of resource, optional descending/up link reserved area from the corresponding dominant base in optional descending/uplink relay district of base station, equally, optional descending/up link the reserved area of the corresponding dominant base in optional descending/uplink relay district of dominant base, if dominant base optional descending/up link district is simultaneously selected with the optional descending/up link district from the base station, then the two is strict time-multiplexed.
7. method according to claim 1 is characterized in that:
Descending sub frame in the step (a) on the transmission time prior to the sub-frame of uplink in the step (1).
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| CN104012148B (en) * | 2011-12-23 | 2018-01-12 | 艾尔斯潘网络公司 | The system and method for determining communication scheduling for the via node of wireless relay network |
| CN104012148A (en) * | 2011-12-23 | 2014-08-27 | 艾尔斯潘网络公司 | System and method for determining a communications schedule for relay nodes of a wireless relay network |
| CN106412993A (en) * | 2015-07-31 | 2017-02-15 | 中国电信股份有限公司 | Method, base station and system for balancing load |
| CN106412993B (en) * | 2015-07-31 | 2019-12-06 | 中国电信股份有限公司 | method, base station and system for balancing load |
| CN106686658A (en) * | 2016-12-22 | 2017-05-17 | 南京邮电大学 | Section relay load balancing method applied to downlink OFDMA cellular network |
| CN106686658B (en) * | 2016-12-22 | 2020-11-13 | 南京邮电大学 | Interval relay load balancing method applied to downlink OFDMA cellular network |
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