CN103516420A - Method for improving bandwidth utilization rate in heterogeneous network and base station - Google Patents
Method for improving bandwidth utilization rate in heterogeneous network and base station Download PDFInfo
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Abstract
The invention provides a method for improving a bandwidth utilization rate in a heterogeneous network and a base station. The method comprises the following steps that: a base station obtains position information of a multicast broadcast single frequency network (MBSFN) subframe, an almost blank subframe (ABS), or an air interface synchronization subframe; and the base station completes functions of at least two of the MBSFN subframe, the ABS, and the air interface synchronization subframe at the subframe corresponding to the position information. According to the embodiment of the invention, on the basis of combination of common points of three functions of an enhanced inter-cell interference coordination (eICIC) service, an air interface synchronization service, and a multi-media broadcast multicast service (MBMS) service, when the base station uses the three kinds of functions simultaneously, an original mode of respective occupation of three different subframes is modified into a mode of simultaneous usage of one same downlink subframe or two downlink subframes, thereby substantially saving the bandwidth.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to method and the base station of in a kind of heterogeneous network, improving bandwidth availability ratio.
Background technology
OFDM (Orthogonal Frequency Division Multiplexing, OFDM) technology is a kind of Multicarrier Transmission Technology, it is the high speed transmission technology under a kind of wireless environment being developed by multi-carrier modulation (Multi-Carrier Modulation, MCM).OFDM technology is divided into many orthogonal sub-channels by given channel in frequency domain, on every sub-channels, each subcarrier is modulated, and each subcarrier carries out parallel transmission.OFDM (Orthogonal Frequency Division Multiple Access, OFDMA) be the access mode of ofdm system, in OFDMA mode Xia， base station, realize multiple access for the method for each user assignment parton carrier wave.OFDMA is different from frequency division multiplexing FDMA (Frequency Division Multiple Access) mode: OFDMA mode does not need as traditional F DMA, adopts protection frequency range to distinguish the signal of different user between each user's frequency.
Worldwide interoperability for microwave access (World Interoperability for Microwave Access, WiMAX) system adopts OFDMA technology, its time division multiplexing (Time Division Duplexing, TDD) frame structure of pattern is as Fig. 1, frame structure is a two-dimensional structure, transverse axis is comprised of the symbol (Symbol) of time domain, the longitudinal axis is that the subcarrier of frequency domain forms, and in figure, TTG represents that sending/receiving transmission intercal (Transmit/Receive Transition Gap) is for descending sub frame and the interpulse interval of subsequent uplink burst.Can see that descending sub frame take leading (Preamble) as starting, leadingly be mainly used in physical layer synchronization and equilibrium.After leading, be frame control section (FCH, Frame Control Header), in addition, if also have a descending mapping (DL-MAP) message in present frame, carry so just and then frame control head FCH (the Frame Control Head) appearance of burst (Burst) of DL-MAP message.And if this downlink frame also needs to transmit up mapping (UL-MAP) message, this UL-MAP message is and then DL-MAP message appearance also.Subsequent frame is partly used for transmitting data, and this part is comprised of a plurality of bursts.
Long Term Evolution (Long Term Evolution, LTE) physical layer is also to adopt OFDMA technology, it has two kinds of wireless frame structure: Type 1, be applicable to FDD (Frequency Division Duplexing), as shown in Figure 2, it is 10ms radio frames, is divided into 20 time slots (Slot), 10 subframes (Subframe).Each subframe 1ms, comprises 2 time slots, each time slot 0.5ms.Uplink and downlink transmission is carried out on different frequency; Type 2, are applicable to TDD (Time Division Duplexing), and as shown in Figure 3, up-downgoing separates in time, and carrier frequency is identical; It is 10ms radio frames, is divided into the field that 2 length are 5ms (Half-Frame).The time slot that each field is 0.5ms by 8 length and 3 special area descending pilot frequency time slot (Downlink Pilot Time Slot; DwPTS), protection interval (Guard Period; GP) and uplink pilot time slot (Uplink Pilot Time Slot; UpPTS) form; the total length of DwPTS, GP and UpPTS equals 1ms, and wherein the length of DwPTS and UpPTS is configurable.
Heterogeneous network is with respect to conventional communication networks, it has introduced the less transmitting node of some base station transmitting powers, comprise Pico cell (Pico Cell), femtocell (Femto Cell) and for the relay station (Relay) of signal relaying, these node deployments are in the coverage of traditional macro station, it can improve the edges cover of macro station, or improves the throughput of hot zones.This technology is the solution of the indoor covering of a kind of expanding mobile communication, the speech that user mobile phone can be sent and data call are transferred to the third generation (the 3rd Generation based on standard interface, 3G) core network, Qie Ta family access point plug and play, can be connected to any existing transmission network based on Internet Protocol (Internet Protocol, IP).
The introducing of these nodes can provide good guarantee for indoor and covering focus scene, and its transmitting power is little, is convenient to on-premise network neatly; The coverage of these nodes is little simultaneously, can utilize more easily the potential high band frequency spectrum of LTE (LTE-Advanced) of enhancing.But the introducing of new node has changed original topology of networks, make the presence of intercell interference of this network configuration become a new challenge.
Along with ever-increasing data service requirement, by the Inter-Cell Interference Coordination in simple cell splitting or LTE R8 and R9 (Inter-cell interference coordination, ICIC) technology, be difficult to meet the requirement that improves data capacity and cell edge spectrum efficiency.In heterogeneous network, interference coordination strengthens the technology that eICIC (enhanced ICIC) is a kind of energy elevator system throughput and network whole efficiency, and blank subframe (Almost Blank Subffame almost, ABS) be the major technique of eICIC, it can solve the interference problem between base station.When being configured to ABS frame, do not transmit control channel, do not send data yet, only need to send cell reference signals (Cell Reference Signal, CRS), the interference that other communities are subject in these subframe transmission data will be smaller, so the core concept of ABS technology is exactly certain cell configuration ABS subframe, related cell, in these subframe scheduling data, reduces thereby play the effect of disturbing.
In mobile communication system, co-channel interference is the key factor of system for restricting capacity.The realization of identical networking technology makes co-channel interference develop into adjacent cell interference, disturbs the restriction of power system capacity is seemed to particularly outstanding.For LTE, not only this community can be disturbed in the base station of neighbor cell, and the subscriber equipment of neighbor cell (User Equipment, UE) also can disturb the UE of this community.For fear of above-mentioned interference problem and raising power system capacity, LTE system requirements is realized strict time synchronized between each base station, this just requires Femto after powering on, to complete with macro station or other Femto base station and completes air interface synchronization and time synchronized, reduces the interference between base station.
The radio circuit of air interface synchronization and the radio circuit of regular traffic share, and are carrying out when synchronous in order to reduce the impact on UE, and descending employing sends the method for synchronous subframe.Radio frequency will be switched to fast accepting state after the symbol of control channel that sends synchronous subframe, receive the down-bound pilot frequency signal of macro station or other small base station.
Multimedia broadcast-multicast service (Multimedia Broadcast Multicast Service, MBMS), that 3GPP is organized in the key property of introducing in R6 version, it is a kind of point-to-multipoint business of data that simultaneously transmits for a plurality of users in realizing from data source to particular range, thereby make network (comprising core net and Access Network) resource be shared, with less resource, be embodied as the user in a large number with same requirements provides business as multimedia service etc. simultaneously.
MBMS business is realized by multicast Single frequency network (Multicast Broadcast Single Frequency Network, MBSFN) subframe.All descending sub frames of transmission clean culture Physical Downlink Shared Channel (Physical Downlink shared Channel, PDSCH) signal can be configured to MBSFN subframe by high level.In each MBSFN subframe, above 1 or 2 OFDM symbols do not carry MBSFN signal, concrete symbolic number is by Physical Control Format Indicator Channel (Physical Control Format Indicator Channel, PCFICH) point out, in this subframe, remaining symbol is the business datum of dispatched users no longer, only transmission broadcast or multicast packet.System information block 2 in LTE (System Information Block 2, SIB2) message will be MBSFN subframe by which subframe of notice UE, the UE in multicast group is not receiving after this SIB2 message multi-case data that can not this subframe of demodulation.
EICIC function has been introduced special ABS subframe in order to reduce to disturb, and descending ABS subframe does not send data; And air interface synchronization function is own to other base station synchronization signal of eating dishes without rice or wine in order to make, at certain descending sub frame, can not send data; In order to realize MBMS business, base station also can not send user's business datum at certain descending sub frame, and only transmission is broadcasted or multicast packet, and it is MBSFN subframe which subframe of UE is notified by SIB2 in base station, and the UE in multicast network can downlink data receiving.If this three kinds of functions are being realized in base station, while using respectively different subframes, will take three descending sub frames, this is to being originally very large waste with regard to rare wireless bandwidth so.
Summary of the invention
The embodiment of the present invention provides a kind of method, to solve the problem of the waste wireless bandwidth that takies three descending sub frames when realizing three kinds of different business and cause.
The embodiment of the present invention provides a kind of method that improves bandwidth availability ratio in heterogeneous network, and the method comprises:
Multicast Single frequency network (MBSFN) subframe, the positional information of blank subframe (ABS) or air interface synchronization subframe are almost known in base station;
Described base station completes the function of at least two kinds of subframes in described MBSFN subframe, described ABS and described air interface synchronization subframe in subframe corresponding to this positional information.
Preferably, described base station completes the function of at least two kinds of subframes in described MBSFN subframe, described ABS and described air interface synchronization subframe in subframe corresponding to this positional information, comprising:
Described base station is by the unified cycle, in subframe corresponding to this positional information, completes the function of at least two kinds of subframes in described MBSFN subframe, described ABS and described air interface synchronization subframe.
Preferably, described method also comprises: described base station is when subframe corresponding to this positional information completes the function of described ABS, and described base station is subframe corresponding to this positional information user of this base station of dispatching home location not.
Preferably, described method also comprises: described base station is when subframe corresponding to this positional information completes the function of described air interface synchronization subframe, and described base station is accepting state in subframe corresponding to this positional information by sending state-transition.
Preferably, described base station comprises Pico cell, femtocell and relay station.
The embodiment of the present invention also provides ，Gai base station, a kind of base station to comprise:
Know module, for knowing multicast Single frequency network (MBSFN) subframe, the positional information of blank subframe (ABS) or air interface synchronization subframe almost;
Processing module, for completing the function of described MBSFN subframe, described ABS and at least two kinds of subframes of described air interface synchronization subframe in subframe corresponding to this positional information.
Preferably, described processing module, specifically for by the unified cycle, completes the function of at least two kinds of subframes in described MBSFN subframe, described ABS and described air interface synchronization subframe in subframe corresponding to this positional information.
Preferably, described processing module, also for when subframe corresponding to this positional information completes the function of described ABS, subframe corresponding to this positional information user of this base station of dispatching home location not.
Preferably, described processing module, also for when subframe corresponding to this positional information completes the function of described air interface synchronization subframe, the subframe corresponding in this positional information is accepting state by sending state-transition.
Preferably, described base station comprises Pico cell, femtocell and relay station.
The embodiment of the present invention is in conjunction with the common ground of eICIC, air interface synchronization and three kinds of functions of MBMS business, while using this three kinds of functions in base station simultaneously, will be originally take respectively three different subframes and be revised as and use same descending sub frame or two descending sub frames simultaneously, thereby save bandwidth widely.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of frame structure of the time division multiplexing of existing WiMAX;
Fig. 2 is the schematic diagram of existing FDD frame structure;
Fig. 3 is the schematic diagram of existing TDD frame structure;
Fig. 4 disturbs the schematic diagram of scene in heterogeneous network of the present invention;
Fig. 5 is eICIC structural representation of the present invention;
Fig. 6 is air interface synchronization structural representation of the present invention;
Fig. 7 is MBSFN structural representation of the present invention;
Fig. 8 improves the flow chart of the embodiment of the method for bandwidth availability ratio in heterogeneous network of the present invention;
Fig. 9 is the structural representation that the present invention completes three kinds of function subframes;
Figure 10 is the structural representation of base station embodiment of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, hereinafter in connection with accompanying drawing, embodiments of the invention are elaborated.It should be noted that, in the situation that not conflicting, the embodiment in the application and the feature in embodiment be combination in any mutually.
First, to improving the embodiment that three kinds of technology take different downlink frame in the present invention, elaborate by reference to the accompanying drawings:
Fig. 4 is a kind of the most typical scene in heterogeneous network, and in figure, MeNB and HeNB are respectively macro station He little Wei base station, and MUE and HUE are respectively macro station user He little Wei base station user.In this scene, MUE under macro station close HeNB progressively, the downstream signal from HeNB that now MUE receives progressively strengthens, at this moment the downstream signal of HeNB is exactly interference signal for MUE, due to HeNB closed loop user group (Closed Subscriber Group normally, CSG), so MUE can not be switched under HeNB, the MUE of non-like this CSG will be subject to the descending strong jamming of HeNB.If this MUE is in the larger power emission of up employing simultaneously, this MUE also can produce interference to the up channel of the UE under HeNB.
Up-downgoing proportioning # 4 with LTE TDD illustrates the embodiment of the present invention below, in proportioning # 4 form, this frame has 7 descending sub frames, 2 sub-frame of uplink and a special subframe, as shown in Figure 5, the mode that the method that reduces interference in heterogeneous network and adopt staggers by non-complete time domain avoids interference, the mode that non-complete time domain staggers is to distinguish the UE that is disturbed UE and is not disturbed, for being disturbed UE, for MeNB and HeNB, time domain staggers, but the UE not being disturbed can stagger.Interference scene for Fig. 4, that disturbed is the MUE of non-CSG, the scheduling time of the HUE of MUE and HeNB need to be staggered, in Fig. 5, show that MeNB dispatches the MUE of disturbed non-CSG at descending sub frame # 4, and HeNB adopts ABS in this subframe, this subframe is dispatched users not, can reduce the degree that MUE is disturbed like this.
Little base station in power up or the cycle need to complete air interface synchronization from macro base station Huo little base station, can reduce like this phase mutual interference between base station, also complete the time synchronized between base station simultaneously.In FDD system, downstream bands changes reception at synchronization point into by transmission, and without downlink business scheduling, upstream band, not in accepting state, reports without ascending control information.In TDD system, carry out synchronous subframe and should be descending sub frame, at synchronization point descending sub frame, by transmission, change reception into, receive the synchronizing signal of last layer base station.Fig. 6 is that the method for air interface synchronization employing is carried out in heterogeneous network ZhongTDD little base station from macro base station, and HeNB is accepting state at #5 descending sub frame by sending state-transition, receives from the signal of eating dishes without rice or wine of MeNB transmitting and completes and the synchronizeing of MeNB.
Fig. 7 WeiTDD base station, by MBSFN subframe bearing MBMS service, by the position of SIB information broadcast MBSFN subframe, does not add the terminal of MBMS service groups not receive data in MBSFN subframe in LTE system Zhong， base station.In Fig. 7, #6 descending sub frame is decided to be to MBSFN subframe, does not add the user under the little base station of MBMS service groups can not receive data in this subframe.
From Fig. 5,6 and 7, can find out, if at least two kinds in ABS, air interface synchronization and MBSFN subframe function can be supported in base station simultaneously, can effectively improve bandwidth availability ratio.Now, the function of using subframe # 4, subframe # 5 and tri-subframes of subframe # 6 to complete can be completed by two subframes or a subframe.
Therefore, the embodiment of the present invention provides a kind of method that improves bandwidth availability ratio in heterogeneous network, and as shown in Figure 8, the method comprises:
Described base station is by the unified cycle, in subframe corresponding to this positional information, completes the function of at least two kinds of subframes in described MBSFN subframe, described ABS and described air interface synchronization subframe.
Wherein, above-mentioned base station can inform which subframe of UE in this base station range is MBSFN subframe by SIB2 message, and realizes eICIC and air interface synchronization function in this MBSFN subframe simultaneously; Above-mentioned base station can obtain by configuration the positional information of ABS, and realizes MBSFN subframe and air interface synchronization function at this ABS simultaneously; By configuration, obtain the positional information of air interface synchronization subframe, and in this air interface synchronization subframe, realize the function of eICIC and MBSFN subframe simultaneously.
In addition, described base station is when subframe corresponding to this positional information completes the function of described ABS, and described base station is subframe corresponding to this positional information user of this base station of dispatching home location not.Described base station is when subframe corresponding to this positional information completes the function of described air interface synchronization subframe, and described base station is accepting state in subframe corresponding to this positional information by sending state-transition.
In Fig. 5-7, ABS, air interface synchronization and MBSFN subframe function have the different cycles and in different subframe position, in the design of base station realizes, by the cycle of unified these three functions, for example, by the cycle period unification of eICIC, air interface synchronization and tri-subframes of MBSFN, be 20ms, three subframes that three functions are used are incorporated in a subframe, as shown in Figure 9, are three functions to be unified in to #6 subframe realize.Certainly, also three functions can be unified in to #4 subframe or #5 subframe realizes; By a subframe, realize three functions, saved like this subframe, unnecessary subframe can be used for as more user's service, and this mode has promoted the throughput of base station and can provide service for more user.， little Wei base station HeNB is in #6 work song frame dispatched users not in addition, and macro station MeNB dispatches from the HeNB that is subject to close to HeNB and disturbs large user MeUE in this subframe of correspondence.HeNB can not interfere with MeUE like this, again because HeNB does not have dispatched users in this subframe, from the upward signal of the MeUE close to HeNB on not impact of HeNB.This mode has also reduced the interference between macro station He little Wei base station in heterogeneous network.
WiMAX be take OFDM as basic technology, and the embodiment of the present invention is suitable for it equally, and in its frame structure, descender is equivalent to the descending sub frame in LTE.
As shown in figure 10, for comprising, the structural representation ，Gai base station of base station embodiment of the present invention knows module 11 and processing module 12, wherein:
Know module, for knowing multicast Single frequency network (MBSFN) subframe, the positional information of blank subframe (ABS) or air interface synchronization subframe almost;
Processing module, for completing the function of described MBSFN subframe, described ABS and at least two kinds of subframes of described air interface synchronization subframe in subframe corresponding to this positional information.
Wherein, described processing module, specifically for by the unified cycle, completes the function of at least two kinds of subframes in described MBSFN subframe, described ABS and described air interface synchronization subframe in subframe corresponding to this positional information.
In addition, described processing module, also for when subframe corresponding to this positional information completes the function of described ABS, subframe corresponding to this positional information user of this base station of dispatching home location not; Or, described processing module, also for when subframe corresponding to this positional information completes the function of described air interface synchronization subframe, the subframe corresponding in this positional information is accepting state by sending state-transition.
Wherein, described base station comprises Pico cell, femtocell and relay station etc.
Above-mentioned base station, common ground in conjunction with eICIC, air interface synchronization and three kinds of functions of MBMS business, while using this three kinds of functions in base station simultaneously, the method that takies respectively different subframes is originally revised as and uses same descending sub frame simultaneously, thereby saved widely bandwidth.
One of ordinary skill in the art will appreciate that all or part of step in said method can come instruction related hardware to complete by program, said procedure can be stored in computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of above-described embodiment also can realize with one or more integrated circuits.Correspondingly, each the module/unit in above-described embodiment can adopt the form of hardware to realize, and also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
Above embodiment is only unrestricted in order to technical scheme of the present invention to be described, only with reference to preferred embodiment, the present invention is had been described in detail.Those of ordinary skill in the art should be appreciated that and can modify or be equal to replacement technical scheme of the present invention, and do not depart from the spirit and scope of technical solution of the present invention, all should be encompassed in the middle of claim scope of the present invention.
Claims (10)
1. in heterogeneous network, improve a method for bandwidth availability ratio, it is characterized in that, the method comprises:
Multicast Single frequency network (MBSFN) subframe, the positional information of blank subframe (ABS) or air interface synchronization subframe are almost known in base station;
Described base station completes the function of at least two kinds of subframes in described MBSFN subframe, described ABS and described air interface synchronization subframe in subframe corresponding to this positional information.
2. method according to claim 1, is characterized in that:
Described base station completes the function of at least two kinds of subframes in described MBSFN subframe, described ABS and described air interface synchronization subframe in subframe corresponding to this positional information, comprising:
Described base station is by the unified cycle, in subframe corresponding to this positional information, completes the function of at least two kinds of subframes in described MBSFN subframe, described ABS and described air interface synchronization subframe.
3. method according to claim 1 and 2, is characterized in that, described method also comprises:
Described base station is when subframe corresponding to this positional information completes the function of described ABS, and described base station is subframe corresponding to this positional information user of this base station of dispatching home location not.
4. method according to claim 1 and 2, is characterized in that, described method also comprises:
Described base station is when subframe corresponding to this positional information completes the function of described air interface synchronization subframe, and described base station is accepting state in subframe corresponding to this positional information by sending state-transition.
5. method according to claim 1 and 2, is characterized in that:
Described base station comprises Pico cell, femtocell and relay station.
6.Yi Zhong base station, is characterized in that ，Gai base station comprises:
Know module, for knowing multicast Single frequency network (MBSFN) subframe, the positional information of blank subframe (ABS) or air interface synchronization subframe almost;
Processing module, for completing the function of described MBSFN subframe, described ABS and at least two kinds of subframes of described air interface synchronization subframe in subframe corresponding to this positional information.
7. base station according to claim 6, is characterized in that:
Described processing module, specifically for by the unified cycle, completes the function of at least two kinds of subframes in described MBSFN subframe, described ABS and described air interface synchronization subframe in subframe corresponding to this positional information.
8. according to the base station described in claim 6 or 7, it is characterized in that:
Described processing module, also for when subframe corresponding to this positional information completes the function of described ABS, subframe corresponding to this positional information user of this base station of dispatching home location not.
9. according to the base station described in claim 6 or 7, it is characterized in that:
Described processing module, also for when subframe corresponding to this positional information completes the function of described air interface synchronization subframe, the subframe corresponding in this positional information is accepting state by sending state-transition.
10. according to the base station described in claim 6 or 7, it is characterized in that:
Described base station comprises Pico cell, femtocell and relay station.
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Application publication date: 20140115 |
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