CN100548071C - Multi-frequency point TD-SCDMA group network and realization of Communication method based on relaying technique - Google Patents
Multi-frequency point TD-SCDMA group network and realization of Communication method based on relaying technique Download PDFInfo
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Abstract
A kind of multi-frequency point TD-SCDMA group network and realization of Communication method based on relaying technique, operating procedure is: (1) planning site, base station, self adaptation is determined the control channel of each base station and the transmitting power of Traffic Channel, and the up-downgoing switching point of each base station is set flexibly, adopt via node that the blind area of Traffic Channel is done to replenish simultaneously and cover; (2) travelling carriage initiates to insert request according to transparent mode, and suitable via node is selected for this inserts request in the base station, and self adaptation is set up suitable communication link, and self adaptation obtains the diversity or the spatial multiplexing gain of relaying; (3) manage concentratedly the Radio Resource of each repeated link the base station, and self adaptation is provided with the transmitting power of control channel and Traffic Channel, and be various Radio Resources such as each relaying and non-repeated link dividing frequency, time slot, sign indicating number.This method solved preferably extended base station coverage, improve power system capacity, reduce presence of intercell interference, the convenient networking of self adaptation, efficiently support many technical problems such as asymmetric traffic.
Description
Technical field
The present invention relates to a kind of networking and realization of Communication method of TD-SCDMA mobile communications network, exactly, relate to a kind of multifrequency point that adopts relaying technique and carry out flexible, the convenient networking and the realization of Communication method of TD-SCDMA mobile communication system, so that can realize the interference of extended coverage range, opposing minizone, the good result of raising system spectral efficiency, belong to the technical field of network design, networking strategy and the network service management of mobile communications network.
Background technology
For mobile communication system, how enlarging power system capacity is the problem that equipment manufacturers and operation commercial city must be considered.The single-frequency point TD-SCDMA system is compared with the WCDMA system at present, and capacity is on the low side relatively.In order to increase power system capacity, carry out the method that overloading covers frequently in same sectors/cells, the TD-SCDMA system increases the important means of power system capacity beyond doubt.
Because the travelling carriage limited amount that single frequency point can provide will be expanded the TD-SCDMA power system capacity, expects increasing the mode of frequency naturally.Relative single-frequency dot system, multiple frequency spot TD-SCDMA system are exactly a plurality of frequencies of configuration in each sub-district, with the expanding system capacity.During TD-SCDMA system single-frequency point networking,, make the time slot 0 (TS0) of neighbor cell and descending pilot frequency time slot (DwPTS) produce time slot and overlap, cause the pilot search difficulty, moving table measuring is frequent and switches problem such as difficulty owing to reasons such as multipaths.If the up-downgoing switching point of each cell configuration is incomplete same, then internal system can exist cross time-slot to disturb again.In addition, because the scrambler of TD-SCDMA system is shorter, interblock correlation and natural order have certain relation, so the minizone be because the interference that brought of code word nonorthogonality can not be ignored, and the introducing of multifrequency point can solve the problem of above-mentioned single-frequency point.If each carrier frequency is considered as a logic district, we can say then that in fact multi-frequency-point community is equivalent to is merged together independently a plurality of single carrier cells originally, and common signal channel merged, so just formed a multi-frequency-point community, improve the service bearer ability of system greatly.
The main feature of multiple frequency spot TD-SCDMA system is: adopt several different frequent points as carrier frequency in the sub-district, one of them is a main carrier frequency, and remaining all is an assistant carrier frequency, and can only there be a main carrier frequency each sub-district.Difference between main carrier frequency and the assistant carrier frequency is whether it carries pilot tone and broadcast message.The carrier frequency of carrying pilot tone and broadcast message is a main carrier frequency, and the carrier frequency that does not carry pilot tone and broadcast message is an assistant carrier frequency.
Primary Common Control Physical Channel (P-CCPCH), Secondary Common Control Physical Channel (S-CCPCH), Physical Random Access Channel (PRACH), downlink pilot frequency channel (DwPCH), Page Indication Channel Common Control Channel such as (PICH) all are to send on main carrier frequency.Physical access channel (FPACH) only sends on main carrier frequency usually, but also can be used for assistant carrier frequency conditionally, one of condition is that travelling carriage can use FPACH channel, the use under other conditions still to remain further to be studied when switching on assistant carrier frequency.UpPCH usually only sends on main carrier frequency, UpPCH uses of on assistant carrier frequency, can having ready conditions, and one of condition is that travelling carriage can use this UpPCH channel when switching on assistant carrier frequency, the use under other conditions also requires study definite.System information broadcast also only carries out on main carrier frequency.Common signal channel is limited on the main carrier frequency, has reduced the interference between the common signal channel carrier frequency, has improved systematic function, makes the travelling carriage initial ranging accurately, fast; Only on main carrier frequency, send out public information simultaneously, with the interference that reduces greatly other system.
Main carrier frequency adopts identical scrambler and basic training sequences (Midamble) sign indicating number with assistant carrier frequency, and the identical time slot transfer point of proposed arrangement, and travelling carriage just can obtain the frequency configuration of system information of subdistricts and other assistant carrier frequencies by the search main carrier frequency.Make travelling carriage just can't obtain this problem of configuration information of system information and other assistant carrier frequencies for fear of breaking down, can adopt the main carrier frequency method for reconfiguration owing to main carrier frequency.The main carrier frequency method for reconfiguration is exactly when main carrier frequency breaks down, system reconfigures main carrier frequency, the configuration information of system information of subdistricts and other assistant carrier frequencies can be broadcasted again, and the specific implementation method can be by using the redundancy backup carrier frequency or seizing assistant carrier frequency and realize.
The multifrequency point technology can the expanding system coverage, particularly adopt main carrier frequency and assistant carrier frequency technology can reduce interference between the control channel of minizone, but for the TD-SCDMA mobile communication system, under the whole network covering scene, how to realize support to high-speed data service, and guarantee power system capacity under indoor scene still to face very large challenge.Its main difficulty is:
(1) if the work of the smart antenna of TD-SCDMA is undesirable, for example error appears in the wave beam travelling carriage that aims at the mark, then the antijamming capability of TD-SCDMA descends, exist in the bigger sub-district and presence of intercell interference, wherein interference can be alleviated preferably by the joint-detection in the sub-district in the sub-district, and presence of intercell interference is mainly derived from the interference of adjacent base station, and the big correlation of adjacent base station scrambler, adopts the technical difficulty of associated detection technique reduction presence of intercell interference bigger.
(2) adopt the multifrequency point technology, disturb though can significantly reduce control channel, for Traffic Channel, still have bigger presence of intercell interference, reason is that the Traffic Channel between neighbor cell does not adopt code division multiplexing according to physical distance, and the characteristic that interferes with each other of scrambler is bigger.
(3) because the control channel of TD-SCDMA system adopts frequency multiplexing technique, transmitting power is bigger, yet because the interference of minizone, in order to guarantee service quality, the transmitting power of Traffic Channel is little compared to control channel, this moment, the coverage distance of Traffic Channel was less, had professional coverage hole at cell edge.
(4) in order to expand the coverage of TD-SCDMA, generally adopt repeater and radio frequency remote technology.But radio frequency interference can be brought in the repeater, and the repeater need obtain slot synchronization information, has increased the cost of repeater like this.Adopt the radio frequency remote technology will very carefully carry out the planning and designing of power and scrambler etc., also will carry out the layout of wired carriers such as optical fiber specially, be not easy to convenient networking and low-cost O﹠M.
(5) in order to reduce neighbor cell interference, multi-frequency point TD-SCDMA is generally the configuration mode that neighbor cell adopts identical time slot at present.The neighbor cell self adaptation is provided with its uplink and downlink timeslot switching point if desired, and TD-SCDMA is easy to generate more serious cross time-slot and disturbs.Disturb in order to reduce cross time-slot, the transmitting power of Traffic Channel is less, thereby causes the discontinuous covering in sub-district, and this method is actually employings is enough between the base station physical isolation apart from the transmission quality of protecting communication link; But caused the communication service of Traffic Channel discontinuous.
Because above various reasons makes the multi-frequency point TD-SCDMA mobile communications network have many-sided problems such as capacity, covering, network design, asymmetric traffic support on the networking and the communication technology, does not find good solution so far.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind of multi-frequency point TD-SCDMA group network method based on relaying technique, this method proposes to adopt in the multi-frequency point TD-SCDMA mobile communication system relaying technique to come networking and realizes communicate by letter, thereby has solved the coverage, raising power system capacity, minimizing presence of intercell interference, the convenient networking of self adaptation of extended base station preferably, efficiently support many technical problems such as asymmetric traffic.
In order to achieve the above object, the invention provides a kind of multi-frequency point TD-SCDMA group network and realization of Communication method, it is characterized in that: comprise following operating procedure based on relaying technique:
(1) planning site, base station, when determining the transmitting power of the control channel of each base station and Traffic Channel adaptively, make Traffic Channel not realize that the whole network covers continuously, and the up-downgoing switching point of each base station is set flexibly, adopt via node that the blind area of Traffic Channel is done to replenish simultaneously and cover;
(2) travelling carriage initiates to insert request according to transparent mode, the base station is according to after receiving the described access request that this travelling carriage directly initiates to the base station by control channel, according to the information in the described access request, adjudicate this travelling carriage present position, when this travelling carriage is in the direct service area territory, adopt a jumping communication mode and base station to set up DCL;
When travelling carriage is in relaying and replenishes the overlay area, carry out transfer of data between base station and the travelling carriage by via node; At this moment, if the system load of base station less than first threshold value of setting, travelling carriage adopt Cooperative Communication Mechanism simultaneously and a plurality of suitable via node communicate, with diversity or the spatial multiplexing gain of acquisition from described a plurality of suitable via nodes; If the system load of base station is greater than second threshold value of setting, then travelling carriage only communicates with an optimal relay node;
When travelling carriage is in relaying diversity zone, according to the system load of base station and the link circuit condition of via node, determine it is the DCL of foundation and base station, still set up the trunking traffic link of transmitting by via node; At this moment, if the system load of base station is less than the 3rd threshold value of setting, then travelling carriage is set up respectively and the base station direct communication and two communication links that communicate by letter with via node simultaneously, obtain diversity or spatial multiplexing gain simultaneously so that be in this travelling carriage in relaying diversity zone, improve signal quality from base station and via node;
(3) manage concentratedly the Radio Resource of each trunking traffic link the base station, and the transmitting power of control channel and Traffic Channel is set adaptively, and be the Radio Resource that each via node and non-trunking traffic link assignment comprise frequency, time slot and coding.
Described step (1) further comprises following content of operation:
(11) site of planning base station: when the planning and designing of site, base station are carried out in certain zone, select traffic carrying capacity maximum or most important hot zones that the base station is set earlier, at the hot zones that traffic carrying capacity is taken second place or importance is taken second place the base station is set again; Guaranteeing that control channel can cover continuously, Traffic Channel has under the prerequisite of coverage hole, carries out planning and designing according to above rule circulation, up to finishing this regional base station planning;
(12) base station power is set: based on link budget and open Loop Power control algorithm, the control channel of each base station and the Initial Trans of Traffic Channel are set respectively, guarantee that each base station can cover continuously in the control channel information of the TS0 of neighbor cell time slot and descending pilot frequency time slot DwPTS emission, but other business time-slot signals can only the zone, cover part, to guarantee that the business time-slot between neighbor cell does not disturb, the transmitting power of the control channel of this moment is greater than the transmitting power of Traffic Channel;
(13) uplink and downlink timeslot of base station is set: each base station is according to own up-downgoing traffic carrying capacity, and employing slow dynamic channel allocation algorithm is determined its uplink and downlink timeslot switching point; If neighbor cell exists cross time-slot to disturb, then adopt the method for control traffic channel transmission power to guarantee that the interference of cross time-slot allows the interference threshold value less than maximum;
(14) cover as a supplement with via node, the base station services sub-district is segmented, and definite via node zone of living in: for guaranteeing the continuity of service business, coverage hole in the adjacent base station Traffic Channel, via node is set finishes the additional covering of Traffic Channel, but repeating base station is not in the control information of control time slot transmission, and promptly operating mobile station is at transparent mode, and travelling carriage directly receives the control information from the base station; Again the Serving cell of each base station is divided into three zones: adopt the direct service area territory of multifrequency point technology, the relaying diversity zone that via node is set, the relaying that can obtain relaying diversity and spatial multiplexing gain to replenish the overlay area; The travelling carriage that is positioned at relaying diversity zone carries out adaptively selected: directly access base station communicates, carries out trunking traffic, is connected with via node to obtain the communication for coordination of diversity gain with the base station simultaneously through via node; The travelling carriage that is positioned at the additional overlay area of relaying must just can carry out the business transmission by via node, and the travelling carriage that is positioned at the direct service area territory directly carries out business with the base station and is connected;
(15) selection and definite via node and type thereof: via node is that predetermined fixed is arranged on relaying diversity zone, or selection has just in time moved to relaying diversity zone, had the travelling carriage of relay function as via node flexibly; The via node type has fixing, portable, nomadic or low speed moves.
The via node that is provided with in each sub-district is one or more, but all be in relaying diversity zone, the base station is adopted intelligent antenna technology respectively the described via node that is in relaying diversity zone to be carried out wave beam forming and is sent or receive, and carries out omnidirectional or directed professional transmission by this via node that is in relaying diversity zone again.
Described step (3) further comprises following content of operation:
(31) judge the residing coverage of travelling carriage: the base station is by the feedback information of this travelling carriage of identification, adjudicate the residing zone of this travelling carriage, perhaps adjudicate the residing zone of this travelling carriage by the transmission quality or the signal strength signal intensity of adjudicating the ascending control channel that this travelling carriage sends;
(32) select via node, the transmission receiving slot of configuration via node and the up-downgoing wireless channel managed: the base station needs the mobile station in selecting via node of relaying adaptively for each, the selection of via node is concentrated the finishing in base station that is belonged to by this via node, according to current environment of living in of this travelling carriage and link circuit condition, determine to select for use the via node that carries out relay transmission; Relaying technique can not influence the control information of main carrier frequency, when but time slot and channel resource are distributed for each travelling carriage in the base station, need to consider the travelling carriage of trunking traffic to jump and the employed channel code of the second jumping communication link, time slot and carrier frequency resource first, and these resources are managed concentratedly and interference coordination, so that multiplexed resource, reduce to disturb, improve systematic function;
(33) carry out Coordination Treatment to being positioned at the interference of trunking traffic link that relaying replenishes the travelling carriage of overlay area: if be in two travelling carriages that relaying replenishes the overlay area, be in the other side's interference region each other, then preferentially dispose the different frequent points resource for these two travelling carriages, if there is not usable frequency, then dispose different time-gap, to reduce interference; If these two travelling carriages also adhere to different sub-districts separately, then also to be these two different scramblers of travelling carriage trunking traffic link configuration; The base station adopts traditional RRM mechanism that the Radio Resource of the DCL that is in the direct service area territory is managed, but replenish the travelling carriage of overlay area to being in relaying diversity zone and relaying, then to select suitable via node and trunking traffic link, and adopt RRM mechanism based on interference coordination and resource multiplex;
(34) adjudicate, set up trunking traffic link and Resources allocation in the relaying diversity zone: for the travelling carriage that is in relaying diversity zone, if the trunking traffic link-quality can't reach professional communication quality requirement, and have this moment when the nearer via node of this travelling carriage can carry out the relaying forwarding, then this is in the travelling carriage in relaying diversity zone and this nearer via node is set up single-hop trunking traffic link, otherwise directly and the base station set up DCL; If this is in the travelling carriage in relaying diversity zone and the DCL between the base station and all can not satisfies the service transmission quality demand by the trunking traffic link that via node carries out data forwarding, then to consider described DCL and described trunking traffic link are carried out diversity reception and transmission; If this travelling carriage that is in relaying diversity zone has many trunking traffic links that meet the demands that professional transmission can be provided, then select best trunking traffic link according to business demand, guarantee to obtain diversity and spatial multiplexing gain;
(35) adopt interference protection measure based on relaying technique: the application of relaying technique, make can carry out time interval resource in same sub-district or the sector and frequency resource multiplexing.
Described employing comprises following content based on the interference protection measure of relaying technique:
(1) if the load that the base station consumes because being in the travelling carriage service in direct service area territory greater than the 5th threshold value, is the travelling carriage service in direct service area territory only then at this moment;
(2) if the base station has the travelling carriage service that enough Radio Resources are the direct service area territory, and also need to provide service for the travelling carriage that is in relaying diversity zone this moment, then the base station is in the travelling carriage configuration best communication link in relaying diversity zone for this; If the system load of base station is lower than the 6th threshold value, this is in the travelling carriage in relaying diversity zone and the DCL of base station is not enough to guarantee that this is in the communication quality or the transmission rate request of the travelling carriage institute bearer service in relaying diversity zone, then distribute two parts of resources for this travelling carriage that is in relaying diversity zone: portion is used for the base station and this is in the direct communication of the travelling carriage in relaying diversity zone, another part resource is used for the trunking traffic link communication, and this travelling carriage that is in relaying diversity zone receives respectively from the base station with from the information of via node and carry out diversity or multiplexing reception; If this mobile communications quality that is in relaying diversity zone of this moment does not still reach quality of service or transmission rate requirements, then its simultaneously and a plurality of suitable via node communicate, with diversity or the spatial multiplexing gain of acquisition from described a plurality of suitable via nodes;
(3) if the system load of base station is no more than the 7th threshold value, and need provide when serving, then adopt trunking scheme to provide resource allocation for the travelling carriage that this is positioned at the additional overlay area of relaying for the travelling carriage that is positioned at the additional overlay area of relaying; At this moment, if this travelling carriage that is positioned at the additional overlay area of relaying need provide better service quality, and system offers this and is positioned at the Radio Resource abundance that relaying replenishes the travelling carriage use of overlay area, then this via node that is positioned at the mobile station in selecting suitable quantity of the additional overlay area of relaying carries out communication for coordination simultaneously, to obtain satisfied diversity or spatial multiplexing gain.
First threshold value is that 40%, the second threshold value is that 75%, the three threshold value is that 50%, the six threshold value is that 60%, the seven threshold value is 50%.
The present invention is a kind of networking and realization of Communication method that adopts the multi-frequency point TD-SCDMA mobile communication system of relaying technique, this method is that via node fixing or that move is set in the relaying diversity zone that the base station covers, thereby reduce the programming and distribution difficulty of base station significantly, the flexible expansion coverage, improve power system capacity, realized simultaneously can uplink and downlink timeslot point etc. being set self adaptation between the neighbor cell.The technology of the present invention has taken into full account the compatibility with existing multi-frequency point TD-SCDMA mobile communication system, reduces the change to existing base station and travelling carriage hardware device as far as possible, is used for realizing relay networking and communicates by letter with less capital cost.
The multi-frequency point TD-SCDMA group network and the realization of Communication method that the present invention is based on relaying technique arrange that in the sub-district benefit of fixed relay node is: (a) finish the covering of special scenes well, for example covering of indoor heating system etc., (b) reduce angle of arrival evaluated error and the performance that improves intelligent antenna beam shaping, (c) provide extra diversity/spatial multiplexing gain.If adopt mobile via node, then can be considered as potential via node to the travelling carriage that is in relaying diversity zone and has a relay function, save the equipment investment expense greatly.
The advantage of the inventive method is: operating procedure is simple, easy, and is little to the change of existing network and equipment, and each network equipment and travelling carriage adopt centralized management and design principle, and network design is convenient.The present invention is by adopting scrambling code optimum configuration, repeated link multidimensional resource flexible allocation, reducing can significantly improve systematic function because relay station is introduced the interference that causes with several different methods such as sub-district and the additional overlay area of neighbor cell interference coordinations.Therefore, the present invention has good popularization and application prospect.
Description of drawings
Fig. 1 the present invention is based on the multi-frequency point TD-SCDMA group network of relaying technique and the operating procedure flow chart of realization of Communication method.
Fig. 2 covers schematic diagram according to the cell portion territory that the inventive method realizes.
Fig. 3 is the network topology structure figure that arranges via node according to the inventive method in omni cell.
Fig. 4 is the network topology structure figure that arranges via node according to the inventive method in 3 sectors.
Fig. 5 is the embodiment schematic diagram that carries out the time interval resource scheduling according to the inventive method.
Fig. 6 is the correlation curve figure of one embodiment of the invention and the system's technology properties that does not adopt relaying technique.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Referring to Fig. 1, introduce and the present invention is based on the network system networking and the operating procedure that realize method for communicating of relaying technique multi-frequency point TD-SCDMA:
Step 2, travelling carriage initiate to insert request according to transparent mode, and suitable via node is selected for this inserts request in the base station, and self adaptation is set up suitable communication link, and can obtain the diversity or the spatial multiplexing gain of relaying;
Manage concentratedly the Radio Resource of each repeated link step 3, base station, and self adaptation is provided with the transmitting power of control channel and Traffic Channel, and be that each relaying and the distribution of non-repeated link comprise various Radio Resources such as frequency, time slot, sign indicating number.
Respectively above-mentioned three operating procedures are described specifically below.Wherein step 1 comprises following content of operation:
(11) site of planning base station: when the planning and designing of site, base station are carried out in certain zone, select traffic carrying capacity maximum or most important hot zones that the base station is set earlier, at the hot zones that traffic carrying capacity is taken second place or importance is taken second place the base station is set again; Guaranteeing that control channel can cover continuously, but allowing Traffic Channel to have under the prerequisite of coverage hole, carrying out planning and designing according to above rule circulation, up to finishing this regional base station planning;
(12) base station power is set: based on link budget and open Loop Power control algorithm, the control channel of each base station and the Initial Trans of Traffic Channel are set respectively, guarantee that each base station can cover continuously in the control channel information of TS0 time slot and the emission of descending pilot frequency DwPTS time slot, but other business time-slot signals can only the zone, cover part, to guarantee that the business time-slot between neighbor cell does not disturb, the transmitting power of the control channel of this moment is greater than the transmitting power of Traffic Channel;
(13) uplink and downlink timeslot of base station is set: each base station is according to own up-downgoing traffic carrying capacity, and employing slow dynamic channel allocation algorithm is determined its uplink and downlink timeslot switching point; If neighbor cell exists cross time-slot to disturb, then adopt the method for control traffic channel transmission power to guarantee that the interference of cross time-slot allows the interference threshold value less than maximum, promptly guaranteeing to have between the neighbor cell that cross time-slot disturbs by power control has sufficiently long physical protection distance;
(14) cover as a supplement with via node, the base station services sub-district is segmented, and definite via node zone of living in: for guaranteeing the continuity of service business, coverage hole in the adjacent base station Traffic Channel, via node is set finishes the additional covering of Traffic Channel, but repeating base station is not in the control information of control time slot transmission, and promptly operating mobile station is at transparent mode, and it directly receives the control information from the base station; For the Serving cell of this each base station is divided into three zones: adopt the direct service area territory of multifrequency point technology, the relaying diversity zone that via node is set, the relaying that can obtain relaying diversity and spatial multiplexing gain to replenish the overlay area; The travelling carriage that is positioned at relaying diversity zone can be adaptively selected: directly access base station communicates, carries out trunking traffic, is connected with via node to obtain the communication for coordination of diversity gain with the base station simultaneously through via node; Being positioned at the travelling carriage that replenishes the overlay area must just can carry out the business transmission by via node, and the travelling carriage that is positioned at the direct service area territory directly carries out business with the base station and is connected;
Referring to Fig. 2, be presented in the omni cell TD-SCDMA network topology structure figure based on relaying technique, the zone that is positioned at the center shaded portion among the figure is the direct service area territory, base station of adopting the multifrequency point technology, the purpose of She Zhiing is compatible present as far as possible multi-frequency point TD-SCDMA technology like this, and utilize the via node technology, effectively overcome the relevant interference that is caused of minizone scrambler, simplified arrangement of base stations simultaneously, the coverage of extended base station, in conjunction with time domain and frequency domain resource, improve the spectrum efficiency of system.
(15) selection and definite via node and type thereof: but the via node predetermined fixed is arranged on relaying diversity zone, also can select flexibly just in time to have moved to relaying diversity zone, had the travelling carriage of relay function as via node; The via node type has fixing, portable, nomadic or low speed moves.
Figure 3 shows that omni cell adopts the inventive method to select the network topology structure that via node constituted, and Figure 4 shows that 3 sectors employing the inventive method selection network topology structure that via node constituted.
Can specially select to be provided with fixing one or more via nodes respectively at the cell edge of effective coverage range, the base station is adopted smart antenna respectively these fixing via nodes to be carried out wave beam forming and is sent, carry out business by these via nodes again and send, to improve systematic function.
The concrete operations content of step 2 mainly is two parts:
The travelling carriage access process: travelling carriage directly initiates to insert request by control channel to the base station, link circuit condition according to travelling carriage, and the loading condition of system, the base station decision is to set up direct link to communicate by letter with target MS, still selects suitable via node to carry out relaying and transmits.No matter travelling carriage is direct access base station, still by the via node access base station, all carries out resource allocation and management by the base station unification.
Travelling carriage access control algorithm: the base station is according to the access solicited message that receives, the concrete zone of judgement travelling carriage sub-district of living in, and take all factors into consideration the shortest path principle and the system loading conditions of this base station and travelling carriage, determine the access way of travelling carriage: set up direct link and communicate by letter, or select suitable via node to carry out relaying and transmit with this target MS; And these two kinds of access waies all are by this base station seek unity of action resource allocation and corresponding management role.The various factors that need take all factors into consideration during the different access way of following brief description base stations control travelling carriage:
When travelling carriage is in the direct service area territory, adopt a jumping communication mode and base station to set up DCL;
When travelling carriage is in when replenishing the overlay area, carry out transfer of data between base station and the travelling carriage by via node; At this moment, if system load less than first threshold value of setting (as 40% load), then the travelling carriage Cooperative Communication Mechanism simultaneously and a plurality of suitable via node communicate, with diversity or the spatial multiplexing gain of acquisition from a plurality of via nodes; If system load is greater than second threshold value of setting (as 60% load), then travelling carriage only communicates with an optimal relay node;
When travelling carriage is in relaying diversity zone, according to the link circuit condition of system load and via node, determine it is the DCL of foundation and base station, still set up the communication link of transmitting by via node; At this moment, if load is less than the 3rd threshold value of setting (as 50% load), then travelling carriage set up simultaneously respectively with the base station and with the communication link of via node, obtain diversity or spatial multiplexing gain simultaneously so that be in the target MS in diversity zone, to improve signal quality from base station and via node.
The concrete operations content of step 3 mainly is following five parts:
(31) judge the residing coverage of travelling carriage: the base station is by the feedback information of identification travelling carriage, adjudicate the residing zone of this travelling carriage, perhaps adjudicate the residing zone of travelling carriage by the transmission quality or the signal strength signal intensity of the ascending control channel that sends of judgement travelling carriage;
(32) select via node, the transmission receiving slot of configuration via node and the up-downgoing wireless channel managed: the base station needs the via node of mobile station in selecting the best of relaying adaptively for each, the selection of via node is concentrated the finishing in base station that is belonged to by this via node, according to current environment of living in of travelling carriage and link circuit condition, determine to select for use the via node that carries out relay transmission; Introduce via node and can continue to use the down-going synchronous of existing multiple frequency spot TD-SCDMA system, uplink synchronous and mechanism such as access at random, reason is to adopt relaying technique can not influence the control information of main carrier frequency, when but time slot and channel resource are distributed for each travelling carriage in the base station, need to consider the resource allocation problem of the travelling carriage of trunking traffic (to comprise that first jumps and the employed channel code of the second jumping communication link, time slot and carrier frequency resource etc.), and these resources are managed concentratedly and interference coordination, so that when improving systematic function, reduce to disturb by resource multiplex as far as possible;
Referring to Fig. 5, introduce a kind of simply based on the machine-processed embodiment of the allocation of radio resources of timeslot multiplex, at business time-slot TS1, travelling carriage (UE) transmission information is to via node (RS), after RS receives information from travelling carriage at this moment, time slot TS2 in the subframe in the back is transmitted to base station (BS) to the business information from travelling carriage, and the base station will be received the business information of the travelling carriage of transmitting through RS at TS2.In like manner, when the base station had business information to send to travelling carriage, the base station sent to RS to information at the TS4 time slot, and the RS TS5 time slot of certain subframe in the back sends to travelling carriage to information.From the analysis of this sequential flow chart as can be known, for via node RS, the variation of its time slot switching point is comparatively frequent, and this need suitably revise existing mac-layer protocol.When RS receives the business from BS and travelling carriage, when sends business to BS and RS, all need carry out centralized control and scheduling by base station BS.
(33) Coordination Treatment is carried out in the interference of the trunking traffic link that is positioned at the travelling carriage that replenishes the overlay area: if be in two travelling carriages that replenish the overlay area, be in the other side's interference region each other, then preferentially dispose the different frequent points resource for these two travelling carriages, if there is not usable frequency, then dispose different time-gap, to reduce interference; If these two travelling carriages also adhere to different sub-districts separately, then also need to be the different scrambler of travelling carriage repeated link configuration; The base station can adopt traditional RRM mechanism that the Radio Resource of the communication link that is in the direct service area territory is managed, but to being in the travelling carriage of relaying diversity zone and additional overlay area, then to select suitable via node and repeated link, and adopt RRM mechanism based on interference coordination and resource multiplex.Select the concrete principle of via node to be:
(331) the target MS idle node selecting to be positioned at own node coverage, to be in relaying diversity zone and to have relay capabilities requires the communication capacity between base station and via node suitable with the communication capacity between via node and travelling carriage as via node;
(332) set up the direct communication link between via node and the base station, the communication frequency resource that the suppose relay node adopts is f
i, the time slot that takies is T
i, and the employed frequency resource of communicating by letter of via node and target MS is f
j, the time slot that takies is T
j, require to satisfy simultaneously: f
i=f
jAnd T
i≠ T
j
(333) for two adjacent via nodes, if be in mutual interference region, then require these two via nodes communicate employed frequency resource and time interval resource have at least one inequality; Suppose that these two via nodes use identical time slot switching point, the frequency of its use is respectively f
iAnd f
j, the time slot of use is respectively T
iAnd T
j, require to satisfy simultaneously: f
i≠ f
jOr T
i≠ T
j
(334) in order to make via node suitable to the transmittability of this via node link to the transmittability and the base station of target MS link, require the air interface communication ability or the transmission rate of first jumping and the second jumping communication link basic identical or close, carry out the centralized management and the distribution of transmitting power and Radio Resource then.
(335) if whole TD-SCDMA system load is lighter, and target MS needs many trunking traffic links of configuration according to professional transmission requirement, then selects a plurality of suitable via nodes, and carry out communication for coordination with these a plurality of via nodes simultaneously, obtain diversity or multiplexing effect.
(34) adjudicate, set up communication link and Resources allocation in the relaying diversity zone: for the travelling carriage that is in relaying diversity zone, earlier judge that whether the load of TD-SCDMA system is greater than the 4th threshold value (as 70% load), perhaps communication link quality can't reach professional communication quality requirement, and have this moment when the nearer via node of target MS can carry out the relaying forwarding, then target MS and via node are set up single-hop trunking traffic link, otherwise set up direct communication link with the base station;
If this moment, this target MS and base station DCL and carry out two link-qualities that data forwarding communicates by letter by via node and all can not reach the service transmission quality demand then will be considered these two links are carried out diversity reception and transmission; If travelling carriage has many repeated links that meet the demands to transmit for professional, then select many best trunking traffic links (comprising and the DCL of base station and and the repeated link of a plurality of via nodes), to obtain diversity and spatial multiplexing gain according to business demand; Just require this moment the number of links cost performance of communication simultaneously the highest, i.e. multilink diversity/spatial multiplexing gain that brings and the expense ratio optimization that takies multiple communication links.
(35) adopt interference protection measure based on relaying technique: the application of relaying technique makes time interval resource and frequency resource can multiplexingly be in the same cell/section; But, to adopt advanced resource allocation mechanism this moment and based on the interference protection measure of relaying technique, under condition to greatest extent, reduce and disturb and energy consumption, make the multi-frequency point TD-SCDMA network be in efficient operation.Concrete technical measures are:
If it is very many that A is positioned at the travelling carriage in direct service area territory, promptly the base station then only provides service for the travelling carriage in direct service area territory for being in direct service area territory user institute depletion load greater than the 5th threshold value 5 (as 75% load) this moment;
If the B base station has the travelling carriage service that enough Radio Resources are the direct service area territory, and the target MS that be in relaying diversity zone this moment in addition need provide service, then the base station is that travelling carriage adopts the selection diversity technique, selects the optimal communication path to arrive travelling carriage.If system load this moment is lower than the 6th threshold value (as 60% load), and the DCL of travelling carriage and base station is not sufficient to guarantee the communication quality or the transmission rate request of target MS institute loaded service, just can distribute two parts of resources for this target MS: a resource is used for base station and target MS direct communication, a in addition resource is used for repeated link communication, and travelling carriage carries out diversity/multiplexing reception to what receive respectively from the base station with from the information of via node.If the communication quality of target MS of this moment does not still reach quality of service or transmission rate requirements, can be simultaneously and a plurality of suitable via node communicate, thereby acquisition is from the diversity/spatial multiplexing gain of a plurality of via nodes.
If it is the travelling carriage service that is in direct service area territory and relaying diversity zone that there are enough Radio Resources at place, C base station, be that system load is no more than the 7th threshold value (as 50% load), and when in replenishing the overlay area, having travelling carriage that service need be provided, then adopt trunking scheme to provide resource allocation for travelling carriage.At this moment, if target MS need provide better service quality, and system has enough Radio Resources to use for travelling carriage, and then target MS can select the via node of suitable quantity to carry out communication for coordination simultaneously, to obtain satisfied diversity/spatial multiplexing gain.
In sum, the inventive method adopt the relay station technology can effectively solve multi-frequency point TD-SCDMA cell edge region disturb big, base station range is less, adjacent base station can not support asymmetric traffic flexibly, capacity remains further to be improved etc. asks many topics.
Referring to Fig. 6, the performance comparison curve chart of embodiment that introduction employing relaying technique of the present invention carries out and the correlation technique that does not adopt relaying technique.During l-G simulation test, every link adopts the target signal to noise ratio behind the intelligent antenna technology to be-10dB, and each CU spread spectrum length is a spreading code of 16, and 3 frequencies of each omni cell configuration.Travelling carriage adopts " non-relay technology " simulation curve of rhombus mark to show the downlink user service satisfactory rate that adopts the traditional base station networking mode according to shortest path computational methods access base station/via node.Down-link performance numerical value when " 3 via node " simulation curve of employing square markings shows 3 via nodes of each omni cell configuration, this moment, via node evenly distributed, and via node is 0.75 of a radius of society apart from center of housing estate.Adopt " 6 via node " simulation curve of triangle mark to show down link performance number value when 6 via nodes are evenly arranged in each sub-district, this moment, via node was 0.75 times of a radius of society apart from the base station.The result of l-G simulation test shows that when cell load was light, if adopt the shortest path access mechanism, via node can be introduced interference, causes its performance not as direct and base station communication; But, introduce via node and can obviously improve communication performance when system load is increased to 50% and when above; And load is big more, and via node is arranged many more, and performance is good more.The result of l-G simulation test also shows, directly adopt shortest path access base station/via node algorithm performance than the poor performance of associating taking into account system load and shortest path access base station/via node algorithm some.
Claims (7)
1, a kind of multi-frequency point TD-SCDMA group network and realization of Communication method based on relaying technique is characterized in that: comprise following operating procedure:
(1) planning site, base station, when determining the transmitting power of the control channel of each base station and Traffic Channel adaptively, make Traffic Channel not realize that the whole network covers continuously, and the up-downgoing switching point of each base station is set flexibly, adopt via node that the blind area of Traffic Channel is done to replenish simultaneously and cover;
(2) travelling carriage initiates to insert request according to transparent mode, the base station is according to after receiving the described access request that this travelling carriage directly initiates to the base station by control channel, according to the information in the described access request, adjudicate this travelling carriage present position, when this travelling carriage is in the direct service area territory, adopt a jumping communication mode and base station to set up DCL;
When travelling carriage is in relaying and replenishes the overlay area, carry out transfer of data between base station and the travelling carriage by via node; At this moment, if the system load of base station less than first threshold value of setting, travelling carriage adopt Cooperative Communication Mechanism simultaneously and a plurality of suitable via node communicate, with diversity or the spatial multiplexing gain of acquisition from described a plurality of suitable via nodes; If the system load of base station is greater than second threshold value of setting, then travelling carriage only communicates with an optimal relay node;
When travelling carriage is in relaying diversity zone, according to the system load of base station and the link circuit condition of via node, determine it is the DCL of foundation and base station, still set up the trunking traffic link of transmitting by via node; At this moment, if the system load of base station is less than the 3rd threshold value of setting, then travelling carriage is set up respectively and the base station direct communication and two communication links that communicate by letter with via node simultaneously, obtain diversity or spatial multiplexing gain simultaneously so that be in this travelling carriage in relaying diversity zone, improve signal quality from base station and via node;
(3) manage concentratedly the Radio Resource of each trunking traffic link the base station, and the transmitting power of control channel and Traffic Channel is set adaptively, and be the Radio Resource that each via node and non-trunking traffic link assignment comprise frequency, time slot and coding.
2, method according to claim 1 is characterized in that: described step (1) further comprises following content of operation:
(11) site of planning base station: when the planning and designing of site, base station are carried out in certain zone, select traffic carrying capacity maximum or most important hot zones that the base station is set earlier, at the hot zones that traffic carrying capacity is taken second place or importance is taken second place the base station is set again; Guaranteeing that control channel can cover continuously, Traffic Channel has under the prerequisite of coverage hole, carries out planning and designing according to above rule circulation, up to finishing this regional base station planning;
(12) base station power is set: based on link budget and open Loop Power control algorithm, the control channel of each base station and the Initial Trans of Traffic Channel are set respectively, guarantee that each base station can cover continuously in the control channel information of the TS0 of neighbor cell time slot and descending pilot frequency time slot DwPTS emission, but other business time-slot signals can only the zone, cover part, to guarantee that the business time-slot between neighbor cell does not disturb, the transmitting power of the control channel of this moment is greater than the transmitting power of Traffic Channel;
(13) uplink and downlink timeslot of base station is set: each base station is according to own up-downgoing traffic carrying capacity, and employing slow dynamic channel allocation algorithm is determined its uplink and downlink timeslot switching point; If neighbor cell exists cross time-slot to disturb, then adopt the method for control traffic channel transmission power to guarantee that the interference of cross time-slot allows the interference threshold value less than maximum;
(14) cover as a supplement with via node, the base station services sub-district is segmented, and definite via node zone of living in: for guaranteeing the continuity of service business, coverage hole in the adjacent base station Traffic Channel, via node is set finishes the additional covering of Traffic Channel, but repeating base station is not in the control information of control time slot transmission, and promptly operating mobile station is at transparent mode, and travelling carriage directly receives the control information from the base station; Again the Serving cell of each base station is divided into three zones: adopt the direct service area territory of multifrequency point technology, the relaying diversity zone that via node is set, the relaying that can obtain relaying diversity and spatial multiplexing gain to replenish the overlay area; The travelling carriage that is positioned at relaying diversity zone carries out adaptively selected: directly access base station communicates, carries out trunking traffic, is connected with via node to obtain the communication for coordination of diversity gain with the base station simultaneously through via node; The travelling carriage that is positioned at the additional overlay area of relaying must just can carry out the business transmission by via node, and the travelling carriage that is positioned at the direct service area territory directly carries out business with the base station and is connected;
(15) selection and definite via node and type thereof: via node is that predetermined fixed is arranged on relaying diversity zone, or selection has just in time moved to relaying diversity zone, had the travelling carriage of relay function as via node flexibly; The via node type has fixing, portable, nomadic or low speed moves.
3, method according to claim 1 and 2, it is characterized in that: the via node that is provided with in each sub-district is one or more, but all be in relaying diversity zone, the base station is adopted intelligent antenna technology respectively the described via node that is in relaying diversity zone to be carried out wave beam forming and is sent or receive, and carries out omnidirectional or directed professional transmission by this via node that is in relaying diversity zone again.
4, method according to claim 1 is characterized in that: described step (3) further comprises following content of operation:
(31) judge the residing coverage of travelling carriage: the base station is by the feedback information of this travelling carriage of identification, adjudicate the residing zone of this travelling carriage, perhaps adjudicate the residing zone of this travelling carriage by the transmission quality or the signal strength signal intensity of adjudicating the ascending control channel that this travelling carriage sends;
(32) select via node, the transmission receiving slot of configuration via node and the up-downgoing wireless channel managed: the base station needs the mobile station in selecting via node of relaying adaptively for each, the selection of via node is concentrated the finishing in base station that is belonged to by this via node, according to current environment of living in of this travelling carriage and link circuit condition, determine to select for use the via node that carries out relay transmission; Relaying technique can not influence the control information of main carrier frequency, when but time slot and channel resource are distributed for each travelling carriage in the base station, need to consider the travelling carriage of trunking traffic to jump and the employed channel code of the second jumping communication link, time slot and carrier frequency resource first, and these resources are managed concentratedly and interference coordination, so that multiplexed resource, reduce to disturb, improve systematic function;
(33) carry out Coordination Treatment to being positioned at the interference of trunking traffic link that relaying replenishes the travelling carriage of overlay area: if be in two travelling carriages that relaying replenishes the overlay area, be in the other side's interference region each other, then preferentially dispose the different frequent points resource for these two travelling carriages, if there is not usable frequency, then dispose different time-gap, to reduce interference; If these two travelling carriages also adhere to different sub-districts separately, then also to be these two different scramblers of travelling carriage trunking traffic link configuration; The base station adopts traditional RRM mechanism that the Radio Resource of the DCL that is in the direct service area territory is managed, but replenish the travelling carriage of overlay area to being in relaying diversity zone and relaying, then to select suitable via node and trunking traffic link, and adopt RRM mechanism based on interference coordination and resource multiplex;
(34) adjudicate, set up trunking traffic link and Resources allocation in the relaying diversity zone: for the travelling carriage that is in relaying diversity zone, if the trunking traffic link-quality can't reach professional communication quality requirement, and have this moment when this nearer via node of travelling carriage that is in relaying diversity zone can carry out the relaying forwarding, then this is in the travelling carriage in relaying diversity zone and this nearer via node is set up single-hop trunking traffic link, otherwise directly and the base station set up DCL; If this is in the travelling carriage in relaying diversity zone and the DCL between the base station and all can not satisfies the service transmission quality demand by the trunking traffic link that via node carries out data forwarding, then to consider described DCL and described trunking traffic link are carried out diversity reception and transmission; If this travelling carriage that is in relaying diversity zone has many trunking traffic links that meet the demands that professional transmission can be provided, then select best trunking traffic link according to business demand, guarantee to obtain diversity and spatial multiplexing gain;
(35) adopt interference protection measure based on relaying technique: the application of relaying technique, make can carry out time interval resource in same sub-district or the sector and frequency resource multiplexing.
5, method according to claim 4 is characterized in that: described employing comprises following content based on the interference protection measure of relaying technique:
(1) if the load that the base station consumes because being in the travelling carriage service in direct service area territory greater than the 5th threshold value, is the travelling carriage service in direct service area territory only then at this moment;
(2) if the base station has the travelling carriage service that enough Radio Resources are the direct service area territory, and also need to provide service for the travelling carriage that is in relaying diversity zone this moment, then the base station is in the travelling carriage configuration best communication link in relaying diversity zone for this; If the system load of base station is lower than the 6th threshold value, this is in the travelling carriage in relaying diversity zone and the DCL of base station is not enough to guarantee that this is in the communication quality or the transmission rate request of the travelling carriage institute bearer service in relaying diversity zone, then distribute two parts of resources for this travelling carriage that is in relaying diversity zone: portion is used for the base station and this is in the direct communication of the travelling carriage in relaying diversity zone, another part resource is used for the trunking traffic link communication, and this travelling carriage that is in relaying diversity zone receives respectively from the base station with from the information of via node and carry out diversity or multiplexing reception; If this mobile communications quality that is in relaying diversity zone of this moment does not still reach quality of service or transmission rate requirements, then its simultaneously and a plurality of suitable via node communicate, with diversity or the spatial multiplexing gain of acquisition from described a plurality of suitable via nodes;
(3) if the system load of base station is no more than the 7th threshold value, and need provide when serving, then adopt trunking scheme to provide resource allocation for the travelling carriage that this is positioned at the additional overlay area of relaying for the travelling carriage that is positioned at the additional overlay area of relaying; At this moment, if this travelling carriage that is positioned at the additional overlay area of relaying need provide better service quality, and system offers this and is positioned at the Radio Resource abundance that relaying replenishes the travelling carriage use of overlay area, then this via node that is positioned at the mobile station in selecting suitable quantity of the additional overlay area of relaying carries out communication for coordination simultaneously, to obtain satisfied diversity or spatial multiplexing gain.
6, method according to claim 1 is characterized in that: first threshold value is that 40%, the second threshold value is that 75%, the three threshold value is 50%.
7, method according to claim 5 is characterized in that: first threshold value is that 40%, the second threshold value is that 75%, the three threshold value is that 50%, the six threshold value is that 60%, the seven threshold value is 50%.
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Effective date of registration: 20151119 Address after: 510663 Guangzhou Science City, Guangdong Shenzhou Road, No. 10 Patentee after: COMBA TELECOM TECHNOLOGY (GUANGZHOU) Ltd. Address before: 100876 Beijing city Haidian District Xitucheng Road No. 10 Patentee before: Beijing University of Posts and Telecommunications |
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