CN1738473A - Channel allocation method for multi-carrier CDMA system - Google Patents
Channel allocation method for multi-carrier CDMA system Download PDFInfo
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Abstract
The invention discloses a channel distribution method of multi-carrier code division multiple access system, comprising: in each section, selecting one or several frequency points as the main carrier frequency from the distributed frequency points while the left frequency points as auxiliary carrier frequency; according to the priority level, transmitting the downward guide time slot, the broadcast information and the calling information on the main carrier frequency with highest priority and arranging other public control channel on other main carrier frequency; indicating the main carrier frequency of system, so the base station can find the frequency of transmitting broadcast and calling information, and adding the information of frequency points on the all distributed information of all channels; the main and auxiliary carrier frequencies use the same disturbing code and the basic training sequence; operating the multi-time slot arrangement on same carrier frequency; setting the upward-downward switching points of main and auxiliary carrier frequencies as same. The invention can arrange a plurality of main carrier frequencies to provide the public access control channel service and reduce the interface probability and the access time in the accessing time of user terminal.
Description
Technical field
The present invention relates to the channel arrangement method of communication field, particularly relate to a kind of channel arrangement method that is applied in the MC-CDMA system.
Background technology
The same with other mobile communication system, in order to satisfy the ever-increasing demand in mobile communication market, carrying out in same sectors/cells that overloading covers frequently will be the important means that TD-SCDMA (TD SDMA) system increases power system capacity.
Present TD-SCDMA standard is not considered overloading characteristic frequently.Thereby, Uu interface (interface of wireless access network and user side) all carries out at a carrier frequency for operation, the configuration of Radio Resource, and a Cell (unit) has only disposed an absolute frequency point number in the process that Iub interface (interface that connects base station node B and base station controller RNC) sub-district is set up; If overloading frequently, then each carrier frequency is taken as a logic district.For example, for the situation of three sectors, three carrier frequency, then thinking has 9 logic district, finishes independently operation at each sub-district, also is that 9 sub-districts send pilot tone and broadcast message separately.Like this, each carrier frequency of multi-carrier frequency system all must configuration one overlap complete common signal channel, and BCH wherein (broadcast channel), FACH (forward access channel) and PCH (paging channel) are omnidirectional channel.Then multiple carrier frequency base station when actual networking, not only transmitter power is required very high, and, under the situation of identical networking, between carrier frequency the interference of broadcast channel also very serious, the efficient of simultaneity factor is also very low.For typical case shown in Figure 1, it is a cellular mobile communications networks that works in multiple radio frequency, if this network uses the 10MHz bandwidth, each base station is operated on 6 identical carrier frequencies.If a terminal 100 is in the sub-district intersection, it will face following particular problem:
A. Cell searching difficulty.In order to solve the initial cell search problem of TDD (time division duplex) system under Cellular Networks, TD-SCDMA has designed unique frame structure, realizes Cell searching by downward guide time slot (DwPTS).Do not have business datum in this time slot, signal to noise ratio is very high.And in network shown in Figure 1, because neighbor cell all will be at this frequency emission DwPTS, different pilot code, the position of base station distance terminal is more or less the same again, and terminal receives the signal to noise ratio of this steering signal may be at-5dB, even poorer, and adjacent carrier is all similar.Like this, will make very difficulty of initial ranging.
B. terminal is measured complicated.Because each carrier wave is a sub-district, this terminal may measure contiguous 18 sub-districts among Fig. 1 similar identical signal level.In present standard, terminal is only measured 6 sub-districts the strongest, faces far away more than the sub-district of this quantity, and terminal may be absorbed in the measuring process complicated, that be difficult to differentiate fully.
C. switch difficulty.Above-mentioned measurement result is delivered to RNC, will cause the difficulty that is switched and determined, and will cause the handoff procedure that do not stop, and system loading is obviously increased.The also switching determination that may lead to errors reduces the service quality of system.
D. system effectiveness is low.A large amount of measurement results are delivered to RNC, and the handoff procedure that does not stop must will seriously reduce the efficient of system.
Document [1], 3GPP TS 25.430: " UTRAN Iub General Aspect and Principle ".
Document [2], 3GPP TS 25.427: " UTRAN Iur/Iub Interface User PlaneProtocol for DCH Data Stream ".
Document [3], 3GPP TS 25.426: " UTRAN Iur and Iub Interface DataTransport ﹠amp; Transport Signalling for DCH Data Streams ".
Document [4], 3GPP TS 25.435: " UTRAN Iub Interface:User PlaneProtocols for Common Transport Channel Data Streams ".
Document [5], 3GPP TS 25.331: " RRC Protocol Specification ".
Document [6], " in the TD-SCDMA rower, improving the overloading suggestion of characteristic frequently ", Datang Mobile Communication Apparatus Co., Ltd 2004,6.
At above-mentioned defective, in document [6], provided one and solved motion: i.e. the zone that covers frequently for overloading, only on a carrier frequency of cell/section, send pilot tone and broadcast message, a plurality of frequencies use a common broadcasting.Its detailed protocol is as follows:
At each cell/section, from n the frequency that is assigned to, determine one and in same sector, only on main carrier frequency, send DwPTS as main carrier frequency, UpPTS (uplink pilot time slot) and broadcast message (TSO).At present standard, need clearly indicate main carrier frequency, so that NodeB determines to send broadcasting on which frequency, and in the message of channel configuration, need to increase frequency point information, so that terminal and NodeB obtain related content.The other agree as follows:
(1) carrier frequency uses identical scrambler and basic training sequences (Midamble) with minor carrier.
(2) Common Control Channel DwPCH, P-CCPCH, PICH, PRACH, and UpPCH, regulations such as FPACH are configured on the main carrier frequency.
(3) the multi-slot configuration should be defined as on same carrier frequency.
(4) same user's uplink-downlink configuration is on same carrier frequency.
(5) TSO of assistant carrier frequency does not use.
(6) the up-downgoing transfer point configuration consistency of main carrier frequency and assistant carrier frequency.
The benefit that the relative existing standard of this scheme can bring is as follows:
(1) common signal channel is limited on the main carrier frequency, has reduced between the carrier frequency of common signal channel and has disturbed, and improves systematic function.
(2) the terminal initial search accurately, fast.
(3) only on main carrier frequency, send out public information simultaneously, with the interference that reduces greatly other system.
(4) TSO of assistant carrier frequency can be used as dedicated channel, can increase power system capacity.
(5) the terminal measuring process is clear and definite, switches correct.
Yet anatomize the technology motion of above-mentioned technology, it is under solving multicarrier during problem such as terminal Cell searching, measurement, switching, it has brought new problem again, be in the same cell/section, only on main carrier frequency, send DwPTS, UpPTS and broadcast message (TSO), there are following 2 defectives at least in it so:
(1) because in a sector of one 6 carrier wave, be provided with according to present TD-SCDMA physical layer code channel, it will can provide 6 * 3 * 8=144 voice user (12.2k) or 6 * 3 * 16=288 voice user (8k) service at most, yet only allowing UE (user terminal) to send UpPTS on the main carrier frequency inserts, and according to present TD-SCDMA physical layer protocol, have only 8 UpPTS sign indicating numbers to select in the cell/section at most for UE, therefore the number of users that inserts in potential demand more for a long time, user's possibility of collision increases greatly, thereby cause the user to extend turn-on time, even do not insert network.
(2) owing in the same cell/section, only on main carrier frequency, send DwPTS, UpPTS and broadcast message, and these information are vital to the normal service of a sub-district.When the main carrier that causes this cell/section for a certain reason can not normal service (other carrier wave is normal), the end of service (local resource need reconfigure) of all carrier waves of whole sub-district will be caused.
Summary of the invention
Technical problem to be solved by this invention provides a kind of channel arrangement method that is applied in the MC-CDMA system, solve prior art and can cause the user extend turn-on time more for a long time at number of users, and the problem that when a main carrier can not normal service, can cause all carrier service terminations of whole sub-district.
For achieving the above object, the invention provides a kind of channel arrangement method that is applied in the MC-CDMA system, its characteristics are, comprising: at each sub-district, determine one or more frequencies as main carrier frequency from a plurality of frequencies that are assigned to, remaining frequency is as assistant carrier frequency; According to priority, only on the main carrier frequency of limit priority, send downward guide time slot, broadcast message and paging information, other Common Control Channel of configuration on all main carrier frequencies; In system, clearly indicate main carrier frequency, make the base station can determine to send the frequency of broadcasting and paging, and in the message of all channel configurations of system, all increase frequency point information; Main carrier frequency uses identical scrambler and basic training sequences with minor carrier; On same carrier frequency, carry out the multi-slot configuration; The up-downgoing transfer point configuration consistency of main carrier frequency and assistant carrier frequency.
Above-mentioned channel arrangement method, its characteristics are, for having disposed the frequency more than 2 or 2 as the main carrier frequency, then arrange the main carrier frequency from low to high, and its priority reduces successively.According to the height of priority, can determine successively the 1st main carrier, the 2nd main carrier ..., the N1 main carrier.
Above-mentioned channel arrangement method, its characteristics are that the base station guarantees that according to the configuration of base station controller a main carrier at limit priority sends DwPTS, broadcast message (BCH) and paging information (PCH) (TSO).
Above-mentioned channel arrangement method, its characteristics are that other Common Control Channel except that DwPTS, broadcast message (BCH) and paging information (PCH) is configured on all main carrier frequencies.
Above-mentioned channel arrangement method, its characteristics be, when the main carrier that sends the limit priority of DwPTS can not be served because of certain reason, the base station sent downward guide time slot automatically on the main carrier frequency of inferior limit priority; Have only when all main carrier frequencies and all can not serve, the base station just asks base station controller to carry out cell re-configuration.The main carrier that sends the limit priority of DwPTS is embodied as: when can not be served because of certain reason, the base station should be according to the configuration frequency of main carrier, automatically delete this main carrier frequency, and automatically the priority of the main carrier of inferior limit priority is risen to limit priority (priority of other standby main carrier is heightened one-level successively), still on the main carrier of new limit priority, send DwPTS, broadcast message and paging information (TSO) then; Send a piece of news notice RNC simultaneously, RNC is according to this message, (TS0) deletes the corresponding frequency that can't work among the broadcast message BCH afterwards, and also reconfigures the frequency point information of new main carrier frequency point information and Common Control Channel configuration according to mentioned above principle, broadcasts in network.
Above-mentioned channel arrangement method, its characteristics are, the description that described frequency point information only increases in the basic Common Control Channel P-CCPCH of the main carrier frequency of limit priority to all main carrier frequencies, so that when certain main carrier frequency can not provide service, user terminal automatically switches on other main carrier frequency, thereby continues to accept the public service that the base station provides.
Above-mentioned channel arrangement method, its characteristics are that all main carrier frequencies use identical UpPCH code character.
Above-mentioned channel arrangement method, its characteristics are that same user's uplink-downlink configuration not necessarily is configured in (initial stage is configured on the same carrier frequency) on the same carrier frequency.
Above-mentioned channel arrangement method, its characteristics are that the TSO of described assistant carrier frequency can be configured to dedicated channel.
Above-mentioned channel arrangement method, its characteristics are that described code division multiple access system is broadband CDMA system or TDS-CDMA system.
Technique effect of the present invention is:
Compare with the motion of the technology of document [6], the method of the invention except that keep that the relative existing standard of prior art scheme can bring be beneficial to, owing in multicarrier, main carrier quantity and frequency are configurable, increased the flexibility and the reliability of system greatly, mainly showed as follows:
(1) when disposing the main carrier number all the time and be 1, is degenerated to the motion (document [6]) of prior art.
(2) DwPTS, broadcast message (BCH) and the paging information (PCH) of base station transmission can switch automatically according to priority on all main carriers and not need RNC to intervene, all main carriers have only when all can not be worked, system just stops service, just requires RNC to carry out cell re-configuration.
(3) because configurable a plurality of main carriers provide public access control channel service, reduce collision probability and turn-on time in the UE access procedure, thereby improved the base station services grade.
(5) because same user's up-downgoing not necessarily is configured on the same carrier frequency, support that the concurrent transmission rate of UE will strengthen greatly, can support a plurality of users that high speed up-downgoing demand is arranged so need only UE.
Description of drawings
Fig. 1 is the terminal schematic diagram that is in the cellular mobile communications networks.
Embodiment
The open following channel arrangement method of a kind of cell/section under multicarrier of the present invention, the i.e. zone that covers frequently for overloading, base station controller RNC can be according to the carrier number of this cell/section, the main carrier number that potential (activation) number of users (telephone traffic analysis) comes this cell/section of reasonable disposition, its detailed protocol and relevant agree as follows:
Each cell/section, from N the frequency that is assigned to, define one or several (for example N1, general recommendations is 2) as main carrier, the residue carrier wave as auxilliary carrier wave (N-N1) (be described as main 1, main 2 ..., main N1, auxilliary 1, auxilliary 2 ..., auxilliary (N-N1)).
For having disposed the frequency more than 2 or 2 as the main carrier frequency, then arrange the main carrier frequency from low to high, its priority reduces successively.According to the height of priority, can determine successively the 1st main carrier, the 2nd main carrier ..., the N1 main carrier.
The base station can at first only need send DwPTS, broadcast message and paging information (TSO) at the main carrier of limit priority according to the configuration of RNC.
Common Control Channel P-CCPCH (corresponding BCH and PCH transmission channel) is configured on the TSO of the highest main carrier of current priority all the time.
Common Control Channel S-CCPCH (corresponding FACH transmission channel), PRACH, PICH, and regulations such as UpPCH, FPACH are configured on all main carrier frequencies; Their channel configuration informations on each main carrier need be broadcasted in BCH.
When the main carrier that sends the limit priority of DwPTS can not be served because of certain reason, the base station should be according to the configuration frequency of main carrier, automatically delete this main carrier frequency, and automatically the priority of the main carrier of inferior limit priority is risen to limit priority (priority of other standby main carrier is heightened one-level successively), still on the main carrier of new limit priority, send DwPTS and broadcast message (TSO) then; Send a piece of news notice RNC simultaneously, RNC is according to this message, (TSO) deletes the corresponding frequency that can't work among the broadcast message BCH afterwards, and also reconfigures the frequency point information of new main carrier frequency point information and Common Control Channel configuration according to mentioned above principle, broadcasts in network.
And the like, to have only when all main carriers all can not provide DwPTS and broadcast message BCH (TSO), the base station just requires RNC must carry out cell re-configuration.
For reducing requirement, can require to stride between each main carrier frequency and dispose Common Control Channel mutually UE;
At present standard, need in the Common Control Channel P-CCPCH of main carrier, increase description, so that NodeB determines to send the frequency of DwPTS, broadcast message BCH and paging information PCH (TSO) to all main carrier frequencies.
In the message of all channel configurations, need to increase frequency point information, so that terminal and NodeB obtain related content.
All main carrier frequencies use identical UpPCH code character.
All main carrier frequencies use identical scrambler and basic midamble with minor carrier.
The multi-slot configuration should be defined as on same carrier frequency;
Same user's up-downgoing not necessarily is configured in (initial stage is configured on the same carrier frequency) on the same carrier frequency;
The TSO of assistant carrier frequency can not dispose common signal channel, but can the configure dedicated channel.
The up-downgoing transfer point configuration consistency of all main carrier frequencies and assistant carrier frequency.
Obviously such scheme will exert an influence to the Uu interface and the Iub interface of existing standard, below carries out labor.
The impact analysis of Uu interface physical layer
Under the configuration of a plurality of main carrier frequencies, only can on main carrier frequency, send DwPTS, UpPTS and broadcast message (TSO), the base station can need to guarantee to send DwPTS at a main carrier at least according to the configuration of RNC, and whether other main carrier sends, and can determine according to reality; When the main carrier that sends DwPTS can not be served because of certain reason, the base station should send DwPTS automatically according to the configuration frequency of main carrier on another main carrier; Have only when all main carriers all can not provide DwPTS, the base station just requires RNC must carry out cell re-configuration.Influential to 25.221 physical channel definitional parts.Need to increase corresponding description.
The DwPTS and the UpPTS of assistant carrier frequency do not use, and TSO does not launch Beacon channel information, influence standard 25.221 frame structure parts, need to increase the description explanation.To the influence of Cell searching, needing increases additional the description to 25.224 relevant portions.
Determine that main carrier frequency uses identical scrambler with assistant carrier frequency, whether sign indicating number distributes, need in the description that Midamble distributes to confirm to comprise to overloading support frequently, 25.221,25.223 relevant portions.
To Common Control Channel, except DwPCH, outside the P-CCPCH, other are as S-CCPCH, PICH, PRACH, and UpPCH, FPACH etc. should specified configuration on main carrier frequency, influential to 25.221 physical channel definitional parts.Need to increase corresponding description.
Configuration should be defined as same carrier frequency for multi-slot, and 25.221 physical channels mapping part needs to increase explanation.
Description to the Beacon channel of agreement partly needs to revise, and only main carrier frequency is defined.
Influence to the physical layer measurement: for the UE that is operated on the assistant carrier frequency, some situation need be monitored main carrier frequency broadcasting or paging information simultaneously, increases for the UE Capability Requirement.Under the Cell-DCH state, TDD requires UE to monitor SIB17, therefore require terminal simultaneously (annotate: can timesharing support) support to receive two carrier frequency.To the measurement of adjacent sub-district, survey adjacent sub-district main carrier frequency.
In a word, only need to increase some and describe at related protocol, little to the influence of physical layer protocol.
(2) to the impact analysis of Uu interface high level
From present standard angle analysis, scheme noted earlier is to not influence of L2 MAC/RLC/PDCP/BMC.
Its influence is analyzed as follows mainly at L3 RRC:
If a sub-district has a plurality of carrier frequency to cover, and has only the information that common signal channel is arranged on the main carrier frequency, the information that system message SIB11, SIB12 all need add relevant minor carrier in the then present system;
The Frequency info of relevant minor carrier need be provided in corresponding specific messages (as measuring control messages);
Exist under the situation of a plurality of frequencies a sub-district, UE need carry out following measurement: the measurement between the inter-frequency measurement of this sub-district and the dominant frequency point of Target cell (also being inter-frequency measurement usually).The message of measuring mainly is included in SIB11/12 and measures in the control messages.
Contain the frequency information that is comprised in the message of frequency information by modification, can support fully has a plurality of frequencies in the same sub-district, and have only a frequency to provide DwPTS, BCH, PCH information, a plurality of frequency that the situation of other common control information is provided, reach the effect that both increases minor carrier information, thereby the expanding system capacity reduces and disturbs; Increase simultaneously the implicit back-up of system's the 1st main carrier again, improve system reliability; Increase the common channel backup, shorten turn-on time.
The present invention relates to the channel arrangement method in the multi-carrier CDMA system, especially be applicable to WCDMA TDD and TD-SCDMA system in the present 3-G (Generation Three mobile communication system).
The above is preferred embodiment of the present invention only, is not to be used for limiting practical range of the present invention; Every according to equivalence variation and modification that the present invention did, all contained by claim of the present invention.
Claims (11)
1, a kind of channel arrangement method that is applied in the MC-CDMA system, its characteristics are, comprising:
At each sub-district, from a plurality of frequencies that are assigned to, determine one or more frequencies as main carrier frequency, remaining frequency is as assistant carrier frequency;
According to the priority of frequency, only on the main carrier frequency of limit priority, send downward guide time slot, broadcast message and paging information, other Common Control Channel of configuration on all main carrier frequencies;
In system, clearly indicate main carrier frequency, make the base station can determine to send the frequency of broadcasting and paging, and in the message of all channel configurations of system, all increase frequency point information;
Main carrier frequency uses identical scrambler and basic training sequences with minor carrier;
On same carrier frequency, carry out the multi-slot configuration;
The up-downgoing transfer point configuration consistency of main carrier frequency and assistant carrier frequency.
2, the channel arrangement method that is applied in the MC-CDMA system according to claim 1, it is characterized in that, for having disposed the situation of the frequency more than 2 or 2 as main carrier frequency, the priority of the pairing main carrier of agreement main carrier frequency according to frequency from low to high, priority reduces successively, and according to the height of priority, determine successively the 1st main carrier, the 2nd main carrier ..., the N1 main carrier.
3, the channel arrangement method that is applied in the MC-CDMA system according to claim 2, it is characterized in that, the base station guarantees that according to the configuration of base station controller a main carrier at limit priority sends DwPTS, broadcast message BCH and paging information PCH and TSO.
4, the channel arrangement method that is applied in the MC-CDMA system according to claim 3 is characterized in that, other Common Control Channel except that DwPTS, broadcast message BCH and paging information PCH is configured on all main carrier frequencies.
5, according to claim 2, the 3 or 4 described channel arrangement methods that are applied in the MC-CDMA system, it is characterized in that, when the main carrier that sends the limit priority of DwPTS can not be served because of certain reason, the base station sent downward guide time slot automatically on the main carrier frequency of inferior limit priority; Have only when all main carrier frequencies and all can not serve, the base station just asks base station controller to carry out cell re-configuration.
6, the channel arrangement method that is applied in the MC-CDMA system according to claim 5, it is characterized in that, when the main carrier that sends the limit priority of DwPTS can not be served because of certain reason, the base station is according to the configuration frequency of main carrier, automatically delete this main carrier frequency, and automatically the priority of the main carrier of inferior limit priority is risen to limit priority, the priority of other standby main carrier is heightened one-level successively, still sends DwPTS, broadcast message and paging information then on the main carrier of new limit priority; Send a piece of news notice RNC simultaneously, RNC is according to this message, delete the corresponding frequency that to work in the broadcast message afterwards, and also reconfigure the frequency point information of new main carrier frequency point information and Common Control Channel configuration, in network, broadcast according to mentioned above principle.
7, the channel arrangement method that is applied in the MC-CDMA system according to claim 5, it is characterized in that, described frequency point information is the description to all main carrier frequencies that only increases in the basic Common Control Channel P-CCPCH of the main carrier frequency of limit priority, so that when certain main carrier frequency can not provide service, user terminal automatically switches on other main carrier frequency, thereby continues to accept the public service that the base station provides.
8, the channel arrangement method that is applied in the MC-CDMA system according to claim 5 is characterized in that, all main carrier frequencies use identical UpPCH code character.
9, the channel arrangement method that is applied in the MC-CDMA system according to claim 5 is characterized in that, same user's uplink-downlink configuration is on different carrier frequency.
10, the channel arrangement method that is applied in the MC-CDMA system according to claim 5 is characterized in that, the TSO of described assistant carrier frequency is configured to dedicated channel.
11, the channel arrangement method that is applied in the MC-CDMA system according to claim 5 is characterized in that, described code division multiple access system is broadband CDMA system or TDS-CDMA system.
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