CN100481998C - Macrodiversity processing method for supporting soft hand-off technique in the centralized base station - Google Patents
Macrodiversity processing method for supporting soft hand-off technique in the centralized base station Download PDFInfo
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- H—ELECTRICITY
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- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
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- H—ELECTRICITY
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Abstract
The invention relates to a soft hand-off method in the centralized base station system. According to the invention, in the case of the mobile terminal performs hand-off, several radio links is synchronously established for the mobile terminal wherein the physical channel processing in the several radio links are achieved by different channel processing units in the multiple channel processing unit; and each radio link in the several different channel processing units perform selective diversity, thus, the mobile terminal can achieve the soft hand-off. Therefore, it solves the hard hand-off problem that happened in the centralized base station system, and it makes the assignment for the channel processing resource in the centralized base station flexible, but is it not limited in the effect of mobility of the mobile terminal.
Description
Technical field
The present invention relates to distributed type base station technology field in the mobile communication system, particularly a kind of method of in the centralized base station systems that adopts radio frequency unit to zoom out, carrying out system resource control and soft handover.
Background technology
In mobile communication system, wireless access network typically is made up of base station (BTS) and the base station controller (BSC) or the radio network controller (RNC) that are used to control a plurality of base stations, shown in Figure 1A, wherein, the base station mainly is made up of unit such as baseband, radio frequency (RF) subsystem and antennas, be responsible for finishing emission, reception and the processing of wireless signal, a base station can cover different sub-districts by a plurality of antennas, shown in Figure 1B.
Fig. 2 has provided another kind of distributed base station, promptly adopts the system configuration of the centralized base station that radio frequency unit zooms out.Compare with the traditional base station, the centralized base station that this employing radio frequency unit zooms out has many advantages: allow to adopt a plurality of Microcells to substitute the macrocell based on the traditional base station, thereby can adapt to different wireless environments better, wireless performances such as the capacity of raising system and covering; Centralized structure makes the soft handover in the traditional base station to finish with More Soft Handoff, thereby obtains extra processing gain; Centralized structure makes that also expensive base band signal process resource becomes the shared resource pool in a plurality of sub-districts, thereby obtains the benefit of statistic multiplexing, lowers system cost.The applying date is the PCT patent WO9005432 on November 11st, 1989, and denomination of invention is " Communications system "; The applying date is the U.S. Pat 5,657,374 in March 23 nineteen ninety-five, and denomination of invention is " Cellular system with centralized basestations and distributed antenna units "; The applying date is the U.S. Pat 6,324,391 on June 28th, 1999, and denomination of invention is " Cellular communicationwith centralized control and signal processing "; And the applying date is the U.S. Patent application US20030171118 on June 5th, 2002, denomination of invention has all disclosed the relevant realization details that adopts this technology of centralized base station that radio frequency unit zooms out for " Cellular radio transmission apparatus and cellular radiotransmission method " waits, described document is quoted from as a reference at this.
As shown in Figure 2, the centralized base station systems that adopts radio frequency unit to zoom out is mainly handled master unit (MU) by the center channel of installing concentratedly and is formed with long-distance radio frequency unit (RRU), link to each other by broadband transmission link or network between them, the BSC/RNC interface unit then is responsible for finishing the user's face and the signaling plane processing of BTS and BSC/RNC interface.The center channel processing subsystem mainly is made up of functional units such as channel processing resource pond and signal route assignment unit, wherein, the channel processing resource pond is piled up by a plurality of channel banks (channel bank 1,2......N) and is formed, finish work such as base band signal process, signal route assignment unit is then according to the difference of each cell business volume (Traffic), the dynamic assignment channel processing resource, it is shared to realize that resources effective is handled in many sub-districts.Signal route assignment unit except as shown in Figure 2 centralized base station is inner realize, also can be used as independent equipment and realize in that centralized base station is outside.Long-distance radio frequency unit mainly is made of the radio-frequency power amplifier of transmission channel, the functional units such as low noise amplifier, duplexer and antenna of receive path.The link of center channel processing subsystem and remote antenna unit typically can adopt transmission mediums such as optical fiber, copper cable, microwave; Signal transmission form can be the digital signal after sampling, or modulated analog signal; Signal can adopt baseband signal, intermediate-freuqncy signal or radiofrequency signal.
As mentioned above, thereby the base band signal process resource pool can be shared the benefit that obtains statistic multiplexing for a plurality of sub-districts in the centralized base station, but in real system, restriction owing to factors such as scale that is subjected to integrated circuit and veneer and system complexities, the formation of the base band signal process resource of a fairly large centralized base station is always discontinuous, be that its base band signal process resource is to be combined by a plurality of relatively independent channel banks, so-called be meant that independently they finish the signal processing tasks of respective channel separately.Each channel bank is responsible for finishing the processing of all up-downgoing physical channels, the processing of up direction typically comprises operations such as matched filtering, despreading, channel estimating, RAKE merging, signal interference ratio (SIR) estimation, deinterleaving, channel-decoding in code division multiple access (CDMA) system, operation such as the processing of down direction then comprises chnnel coding, interweaves, rate-matched, spread spectrum, scrambling, modulation.Because the limited processing ability of each channel bank, when the RRU that can support when centralized base station is larger, the wireless signal of all RRU can both be exchanged to each channel bank simultaneously just do not have practical significance, simultaneously, be subjected to the restriction of signal route assignment unit and system complexity, the wireless signal of all RRU can both be exchanged to each channel bank simultaneously also to be difficult to realize, therefore, each channel bank can simultaneously treated RRU number of signals always limited, that is to say that the corresponding wireless signal of RRU of this not all centralized base station can both exchange to certain channel bank simultaneously.
With Fig. 3 is example, and Fig. 3 is the schematic diagram of centralized base station channel processing resource and wireless signal switching fabric.This centralized base station can be supported M RRU altogether, its base band signal process resource pool combines (channel bank # 1 by N relatively independent channel bank, #2......#N), is K (K≤M) by signal route assignment elements exchange to the RRU number of signals of each channel bank, that is to say, although the signal of M RRU all can exchange to each channel bank, only allow handshaking to a channel bank of maximum K road RRU simultaneously.
On the other hand, in mobile communication system, when mobile terminal locations moves the coverage that exceeds its Serving cell, its wave point need switch to new sub-district and not be interrupted to guarantee conversation, and in code division multiple access (CDMA) system, adopt soft handover and More Soft Handoff technology to realize typically with handoff procedure frequently.With different from a sub-district direct-cut operation simply to another sub-district, soft handover and More Soft Handoff allow portable terminal to keep simultaneously and the communicating by letter of an above sub-district, promptly allow portable terminal to keep a plurality of Radio Links simultaneously, when set up fully with the communicating by letter of new sub-district after disconnect Radio Link with former sub-district again, thereby effectively reduce handover failure rate and obtain power system capacity and the soft handover gain of covering aspect.Wherein, the difference of soft handover and More Soft Handoff is that More Soft Handoff utilizes the RAKE diversity reception to finish in the base station, and soft handover adopts the selective diversity technology to finish in BSC/RNC, so More Soft Handoff can obtain higher handoff gain.
As mentioned above, the base band signal process resource of a fairly large centralized base station is to be combined by a plurality of relatively independent channel banks, and each channel bank only can be handled the RRU signal of some simultaneously, like this, all commutative when the same channel bank when the RRU wireless signal of the sub-district correspondence that portable terminal switches related, can adopt existing technological model ground such as RAKE diversity reception to realize More Soft Handoff.But, when the RRU wireless signal of the sub-district correspondence that portable terminal switches related can't exchange to same channel bank owing to the quantitative limitation of channel bank RRU number of signals, because the relative independentability of different channel banks, make technology such as being difficult to adopt the RAKE diversity reception realize More Soft Handoff, and on the other hand, only support a user face data passage on the interface logic of centralized base station and BSC/RNC, and traditional soft hand-off is realized in BSC/RNC, therefore, when above-mentioned situation takes place, will be difficult to carry out operating in soft handover in the prior art and be forced to adopt hard-switching technology.
With Fig. 4 is example, and Fig. 4 is a kind of schematic diagram of centralized base station channel processing resource.In Fig. 4, certain centralized base station is made of three relatively independent channel bank # 1, #2, #3, and wherein each channel bank allows to handle simultaneously three road RRU wireless signals at most.Channel bank # 1 between supposing at a time, #2, #3 all reaches maximum RRU wireless signal number, be sub-district C1, C2, the RRU signal of C3 correspondence is switched to channel bank # 1, sub-district C4, C5, the RRU signal of C6 correspondence is switched to channel bank #2, sub-district C7, C8, the RRU signal of C9 correspondence is switched to channel bank #3, as shown in the figure, certain portable terminal moves by path A → B shown in the figure → C → D, be not difficult to find out, when this portable terminal moves to C2 by C1, channel bank # 1 will be responsible for carrying out the processing of More Soft Handoff, but, when moving to C6 by C2, because the RRU signal of sub-district C6 correspondence can not be switched to channel bank # 1, therefore this portable terminal direct-cut operation can only be arrived sub-district C6, and carry out corresponding signal process by channel bank #2 based on prior art.Equally, move to C5, C7 by C6 and move to C8 and all can adopt the More Soft Handoff technology, need carry out direct-cut operation but move to C7 by C5.
Because hard-switching technology can not obtain the gain of soft handover and More Soft Handoff, therefore will cause adverse influence to the wireless performance of system, therefore, there is the demand of the technical scheme that can solve the problems referred to above in the prior art.
Summary of the invention
For solving the above-mentioned problems in the prior art, an object of the present invention is: under the situation that portable terminal switches, the present invention proposes to increase a grand diversity processing unit of supporting the soft handover function in centralized base station, by adopting the selective diversity technology, above-mentioned need carry out the situation of direct-cut operation based on prior art the time when taking place, allow corresponding portable terminal to set up a plurality of Radio Links simultaneously, and the physical channel of these Radio Links is handled and can be finished jointly by a plurality of different channel banks, and this grand diversity processing unit is responsible for that then each Radio Link on the different channel banks is carried out selective diversity and is handled.
According to the present invention, a kind of method of supporting soft handover in centralized base station systems has been proposed, wherein said centralized base station systems comprises: the BSC/RNC interface unit of a plurality of long-distance radio frequency units, signal route assignment unit, a plurality of channel bank and an external base station controller/radio network controller (BSC/RNC), and described method comprises step: the judgement of switching according to certain portable terminal needs of being made by BSC/RNC; For described portable terminal is set up a plurality of Radio Links simultaneously, the physical channel of wherein said a plurality of Radio Links is handled and is finished by the different channels processing unit in described a plurality of channel banks; And each Radio Link on described a plurality of different channels processing units is carried out selective diversity handle, so that described portable terminal is realized soft handover.
By using this technology, not only solved the discontinuous direct-cut operation problem of bringing of base band signal process resource in the extensive centralized base station, and made in the centralized base station distribution of channel processing resource more flexible, and be not subject to the ambulant influence of portable terminal.
Description of drawings
When considering preferred implementation of the present invention with reference to the following drawings, the present invention may be better understood, wherein:
Figure 1A has schematically shown the structure of the wireless access network in the conventional mobile communication system;
Figure 1B has schematically shown the basic structure of base station system in the conventional mobile communication system;
Fig. 2 has schematically shown the structure that adopts the centralized base station systems that radio frequency unit zooms out;
Fig. 3 is the schematic diagram of centralized base station channel processing resource and wireless signal switching fabric;
Fig. 4 is the schematic diagram of centralized base station channel processing resource;
Fig. 5 is according to the grand diversity scheme of supporting the soft handover function in the centralized base station of one embodiment of the present invention; And
Fig. 6 is according to the grand diversity scheme of supporting the soft handover function in the centralized base station of another embodiment of the present invention.
Embodiment
As previously mentioned, because the base band signal process resource of a fairly large centralized base station is to be combined by a plurality of relatively independent channel banks, and each channel bank only can be handled the RRU signal of some simultaneously, therefore when the RRU wireless signal of the sub-district correspondence that portable terminal switches related can't exchange to same channel bank owing to the quantitative limitation of channel bank RRU number of signals, for the interface that makes centralized base station and BSC/RNC keeps single user face data passage, need to carry out direct-cut operation in the prior art, thereby can not obtain the gain of soft handover and More Soft Handoff, thereby the wireless performance of system is caused adverse influence.
For this reason, according to the present invention, in centralized base station, increase a grand diversity processing unit of supporting the soft handover function, by adopting the selective diversity technology, above-mentioned need carry out the situation of direct-cut operation based on prior art the time when taking place, allow corresponding portable terminal to set up a plurality of Radio Links simultaneously, and the physical channel of these Radio Links is handled and can be finished jointly by a plurality of different channel banks, and this grand diversity processing unit is responsible for that then each Radio Link on the different channel banks is carried out selective diversity and is handled.By using this technology, not only solved the discontinuous direct-cut operation problem of bringing of base band signal process resource in the extensive centralized base station, and made in the centralized base station distribution of channel processing resource more flexible, and be not subject to the ambulant influence of portable terminal.The present invention can be applied to support CDMA (code division multiple access) mobile communication system of soft hand-off, as systems such as IS-95, WCDMA, CDMA2000.
1, supports grand minute structure set of soft handover function in the centralized base station
＜the first kind of execution mode 〉
With reference to the accompanying drawings 5, shown in Figure 5 a kind of based on the grand diversity scheme of supporting the soft handover function in the centralized base station of the present invention.Can see, according to the grand diversity processing unit of support soft handover function of the present invention and each channel bank # 1, #2 ... #N links to each other, wherein, channel bank # 1, #2 ... #N is responsible for finishing the processing of all up-downgoing physical channels; User's face processing unit of the interface of BTS and BSC/RNC is finished the processing to BTS and BSC/RNC standard interface user plane protocol, comprise that the user wears the processing of inner control signaling and the processing of user face data frame, typical example be in UMTS (universal mobile telecommunications system) system base station be NodeB (Node B) with the Iub interface of RNC in the processing of data framing protocol (FP), after the processing of user's face processing unit of process BSC/RNC interface, the user face data stream of BSC/RNC standard interface is treated to the internal data format of centralized base station.Typically, the internal data format of each channel bank and grand diversity processing unit and grand diversity processing unit and BSC/RNC interface user plane processing unit is a packet data streams, as UDP/IP grouping, AAL2/ATM grouping etc.
At down direction, grand diversity processing unit will be from the packet distribution of each portable terminal downlink data frame of carrying of user's face processing unit of BSC/RNC interface to corresponding channel bank, if promptly have only a channel bank to finish the Channel Processing of certain portable terminal, then grand diversity processing unit simply will be from the packet forward of each portable terminal downlink data frame of carrying of BSC/RNC interface user plane processing unit to corresponding channel bank; If two or more channel banks are finished the Channel Processing of certain portable terminal jointly, then grand diversity processing unit will be distributed to corresponding channel bank respectively for many parts from the packet copies of each portable terminal downlink data frame of carrying of BSC/RNC interface user plane processing unit.
At up direction, grand diversity processing unit will send to BSC/RNC interface user plane processing unit after will handling by selective diversity from the Channel Processing output of each channel bank, specifically, finish the Channel Processing of certain portable terminal if having only a channel bank, then grand diversity processing unit will be forwarded to BSC/RNC interface user plane processing unit from the upstream data packet of this portable terminal of this channel bank simply, if two or more channel banks are finished the Channel Processing of certain portable terminal jointly, then grand diversity processing unit will be derived the upstream data packet of this portable terminal in this TTI and be sent to BSC/RNC interface user plane processing unit based on the selective diversity technology from the packet of this portable terminal of each channel bank output at each TTI (transmission time interval).
According to the present invention, above-mentioned centralized base station is supported in the grand diversity scheme of soft handover function, BSC/RNC interface user plane processing unit and grand diversity processing unit can also be merged into a single functional unit, thus the simplified system realization, shown in Fig. 5 frame of broken lines.
＜the second kind of execution mode 〉
With reference to the accompanying drawings 6, shown in Figure 6 another kind of based on the grand diversity scheme of supporting the soft handover function in the centralized base station of the present invention.In this scheme, grand diversity processing unit links to each other with each channel bank by crosspoint with BSC/RNC interface user plane processing unit, and except that crosspoint, the major function of other unit is identical with scheme shown in Figure 5, but the exchanges data between them is different.Specifically, if have only a channel bank to finish the Channel Processing of certain portable terminal, then corresponding channel bank directly exchanges the relevant up-downgoing packet of this portable terminal by crosspoint and BSC/RNC interface user plane processing unit, and no longer transmits by grand diversity processing unit; If two or more channel banks are finished the Channel Processing of certain portable terminal jointly, all carry out selective diversity about all up-downgoing packets of this portable terminal between then corresponding channel bank and the BSC/RNC interface user plane processing unit and handle via grand diversity processing unit.
As a kind of nonrestrictive preferred embodiment, crosspoint in the scheme shown in Figure 6 is Ethernet crosspoint (LAN Switch), and the data of each channel bank and grand diversity processing unit and grand diversity processing unit and BSC/RNC interface user plane processing unit are the UDP/IP grouping that is carried on the Ethernet.Like this, by with each channel bank, grand diversity processing unit and the different IP address of BSC/RNC interface user plane processing unit configuration, can realize the packet routing operations in the such scheme.
2. the grand diversity in the centralized base station is handled the comparison that reaches with prior art
Support in the grand diversity processing unit function of soft handover function and the prior art grand diversity processing unit functional similarity among the BSC/RNC in the above-mentioned centralized base station, but, directly in centralized base station, carry out grand diversity and handle and in BSC/RNC, carry out grand diversity processing and have following different:
Because transmission without the external transmission network, directly in centralized base station, carry out grand diversity when handling each grand diversity branch delay variation very little, therefore simplified the operation of in BSC/RNC, carrying out each the diversity branch time delay alignment such as Frame buffer memory that to carry out when grand diversity is handled greatly, thereby reduced system's time delay, helped improving the service quality of real time business.
Directly in centralized base station, carry out grand diversity and handle, be convenient to effectively be used to carry out selective diversity and handle, thereby help improving grand diversity processing gain from the soft information of all frame reliabilities of each channel bank.
In fact, in BSC/RNC, carry out grand diversity processing and mainly judge selected branch road according to the value of cyclic redundancy detection (CRC) entrained in each grand diversity branch uplink data frames, even the uplink data frames crc value of certain branch road is indicated wrong generation, then the uplink data frames of this branch road is dropped, if the indication of the uplink data frames crc value of certain branch road does not have wrong the generation, then the uplink data frames of this branch road is selected as last grand diversity output.But, be both the correct or wrong uplink data frames of CRC and still have in various degree unfailing performance, and the difference of this reliability can be by the soft information representation of various reliabilities that obtains in the Channel Processing, these soft information typically comprise:
The frame bit error rate of estimating before the channel decoding (BER), i.e. physical channel BER;
Soft output from Viterbi (Viterbi) decoder of the soft output type of convolution code;
From the soft information of Turbo code, BER or BLER (block error rate) behind for example middle iterative decoding;
The SIR (signal-to-jamming ratio) of the physical channel of estimating by the RAKE receiving element;
And the grand diversity of being carried out in common BSC/RNC is handled, the soft information of the difficult above-mentioned frame reliability of acquisition, thereby difficulty is carried out the processing of effective as selective diversity.But according to the present invention, handle, therefore can directly obtain above-mentioned soft information, thereby allow to adopt effective as selective diversity Processing Algorithm to improve grand diversity processing gain from channel bank owing to directly in centralized base station, carry out grand diversity.The present invention does not limit concrete selective diversity Processing Algorithm, and specific algorithm can be with reference to existing document.
3. the grand diversity in the centralized base station is handled the influence to BSC/RNC
Adopt the present invention, make whole centralized base station and BSC/RNC have single logic interfacing, for BSC/RNC, the switching of all sub-districts that centralized base station is controlled is finished by centralized base station inside, but the control of these handover operations is still equally promptly still finished by BSC/RNC with prior art.In fact, for BSC/RNC, need not to distinguish the More Soft Handoff that the switching of carrying out is channel bank inside in centralized base station, still is the soft handover of being finished by above-mentioned grand diversity processing unit, or this two classes switching takes place in centralized base station simultaneously.Therefore, based on the invention enables when adopting fairly large centralized base station technology, existing system system and protocol specification need not to do any variation, thereby make system be easy to realize.
Below in conjunction with the drawings the method for transmitting signals and the system of the wireless base station that zooms out based on radio frequency of the present invention set forth, but the present invention is not limited to this.One skilled in the art will appreciate that according to the principle of the invention, can make various modifications, improvement, and do not break away from the enclose scope of claim of the present invention the present invention.
Claims (16)
1, a kind of method of in centralized base station systems, supporting soft handover, wherein said centralized base station systems BTS comprises: the BSC/RNC interface unit of a plurality of long-distance radio frequency unit RRU, signal route assignment unit, a plurality of channel bank and an external base station controller/radio network controller BSC/RNC, and described method comprises step:
The judgement of switching according to certain portable terminal needs of making by BSC/RNC;
For described portable terminal is set up a plurality of Radio Links simultaneously, the physical channel of wherein said a plurality of Radio Links is handled and is finished by the different channels processing unit in described a plurality of channel banks; And
Each Radio Link on described a plurality of different channels processing units is carried out selective diversity handle, so that described portable terminal is realized soft handover.
2,, wherein each Radio Link on described a plurality of different channels processing units is carried out the step that selective diversity handles and comprises according to the method for in centralized base station systems, supporting soft handover of claim 1:
A grand diversity processing unit is set between described a plurality of channel banks and described BSC/RNC interface unit, disposes described grand diversity processing unit to finish following steps:
At down direction, will be from the packet distribution of each portable terminal downlink data frame of carrying of described BSC/RNC interface unit to corresponding channel bank;
At up direction, send to described BSC/RNC interface unit after will handling by selective diversity from the Channel Processing output of each channel bank.
3, according to the method for in centralized base station systems, supporting soft handover of claim 2, wherein carry out the processing of BTS and BSC/RNC standard interface user plane protocol in described interface unit, the processing of wherein said agreement comprises that the user wears the processing of inner control signaling and the processing of user face data frame.
4, according to the method for in centralized base station systems, supporting soft handover of claim 2, wherein,
If two or more channel banks are finished the Channel Processing of certain portable terminal jointly, described grand diversity processing unit then is set being distributed to corresponding channel bank respectively for many parts from the packet copies of each portable terminal downlink data frame of carrying of BSC/RNC interface unit; And
If two or more channel banks are finished the Channel Processing of certain portable terminal jointly, described grand diversity processing unit then is set will from the packet of this portable terminal of each channel bank output, deriving the upstream data packet of this portable terminal in this transmission time interval and be sent to described BSC/RNC interface unit at each transmission time interval based on the selective diversity technology.
5, according to the method for in centralized base station systems, supporting soft handover of claim 2, wherein described grand diversity processing unit is arranged in the described BSC/RNC interface unit.
6,, wherein each Radio Link on described a plurality of different channels processing units is carried out the step that selective diversity handles and comprises according to the method for in centralized base station systems, supporting soft handover of claim 1:
By a crosspoint a grand diversity processing unit, described BSC/RNC interface unit are linked to each other with described a plurality of channel banks;
If have only a channel bank to finish the Channel Processing of certain portable terminal, then corresponding channel bank directly exchanges the relevant up-downgoing packet of this portable terminal by described crosspoint and described BSC/RNC interface unit, and no longer transmits by described grand diversity processing unit; And
If two or more channel banks are finished the Channel Processing of certain portable terminal jointly, all carry out selective diversity about all up-downgoing packets of this portable terminal between then corresponding channel bank and the BSC/RNC interface unit and handle via grand diversity processing unit.
7, according to the method for supporting soft handover in centralized base station systems of claim 6, wherein said crosspoint is the Ethernet crosspoint.
8, according to the method for supporting soft handover in centralized base station systems of claim 1, wherein, obtain soft information and handle to carry out the effective as selective diversity from Channel Processing, described soft information comprises:
The frame bit error rate of estimating before the channel decoding;
Soft output from the viterbi decoder of the soft output type of convolution code;
Soft information from Turbo code;
The signal-to-jamming ratio of the physical channel of estimating by the RAKE receiving element.
9, a kind of code division multiple access CDMA mobile communication system of supporting the method for soft handover in centralized base station systems that adopts includes base station controller/radio network controller BSC/RNC and centralized base station systems BTS; Wherein,
Described BSC/RNC is used to make the judgement that certain portable terminal need switch;
Include the BSC/RNC interface unit of a plurality of long-distance radio frequency unit RRU, signal route assignment unit, a plurality of channel bank and an external base station controller/radio network controller BSC/RNC among the described centralized base station systems BTS; And comprise:
First module is used to described portable terminal to set up a plurality of Radio Links simultaneously, and the physical channel of wherein said a plurality of Radio Links is handled and finished by the different channels processing unit in described a plurality of channel banks; And
Second module is used for that each Radio Link on described a plurality of different channels processing units is carried out selective diversity and handles, so that described portable terminal is realized soft handover.
10, according to the CDMA mobile communication system of claim 9, wherein
Described second module is grand diversity processing unit, be arranged between described a plurality of channel bank and the described BSC/RNC interface unit, be used at down direction, will be from the packet distribution of each portable terminal downlink data frame of carrying of described BSC/RNC interface unit to corresponding channel bank; At up direction, send to described BSC/RNC interface unit after will handling by selective diversity from the Channel Processing output of each channel bank.
11, according to the CDMA mobile communication system of claim 10, wherein said BSC/RNC interface unit is used to carry out the processing of BTS and BSC/RNC standard interface user plane protocol, and the processing of wherein said agreement comprises that the user wears the processing of inner control signaling and the processing of user face data frame.
12, according to the CDMA mobile communication system of claim 10, wherein,
If two or more channel banks are finished the Channel Processing of certain portable terminal jointly, then described grand diversity processing unit will be in order to being distributed to corresponding channel bank respectively for many parts from the packet copies of each portable terminal downlink data frame of carrying of BSC/RNC interface unit; And
If two or more channel banks are finished the Channel Processing of certain portable terminal jointly, then described grand diversity processing unit in order to deriving the upstream data packet of this portable terminal in this transmission time interval and be sent to described BSC/RNC interface unit based on the selective diversity technology from the packet of this portable terminal of each channel bank output at each transmission time interval.
13, according to the CDMA mobile communication system of claim 10, wherein described grand diversity processing unit is arranged in the described BSC/RNC interface unit.
14, according to the CDMA mobile communication system of claim 9, wherein said second module is grand diversity processing unit,
By a crosspoint a grand diversity processing unit, described BSC/RNC interface unit are linked to each other with described a plurality of channel banks;
If have only a channel bank to finish the Channel Processing of certain portable terminal, then corresponding channel bank directly exchanges the relevant up-downgoing packet of this portable terminal by described crosspoint and described BSC/RNC interface unit, and no longer transmits by described grand diversity processing unit; And
If two or more channel banks are finished the Channel Processing of certain portable terminal jointly, all carry out selective diversity about all up-downgoing packets of this portable terminal between then corresponding channel bank and the BSC/RNC interface unit and handle via grand diversity processing unit.
15, according to the CDMA mobile communication system of claim 14, wherein said crosspoint is the Ethernet crosspoint.
16, according to the CDMA mobile communication system of claim 9, wherein, described second module obtains soft information and handles to carry out the effective as selective diversity from Channel Processing, and described soft information comprises:
The frame bit error rate of estimating before the channel decoding;
Soft output from the viterbi decoder of the soft output type of convolution code;
Soft information from Turbo code;
The signal-to-jamming ratio of the physical channel of estimating by the RAKE receiving element.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2004/000581 WO2005120110A1 (en) | 2004-06-01 | 2004-06-01 | Soft hand-off method in the centralized base station system |
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| CN1954631A CN1954631A (en) | 2007-04-25 |
| CN100481998C true CN100481998C (en) | 2009-04-22 |
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| CA2730960C (en) * | 2008-07-15 | 2016-07-12 | Reosym Corp. | Multiple access wireless communication system using transmitter-receivers supported by remote software-configured signal processing devices |
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| CN1368829A (en) * | 2001-02-08 | 2002-09-11 | 华为技术有限公司 | Channel soft-switching method for global mobile communication system |
| US6553016B1 (en) * | 1999-12-20 | 2003-04-22 | Telfonaktiebolaget Lm Ericsson (Publ) | Downlink power control at soft handover |
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| JP2777861B2 (en) * | 1992-12-10 | 1998-07-23 | 国際電信電話株式会社 | Mobile communication system |
| US6192038B1 (en) * | 1995-10-18 | 2001-02-20 | Mdiversity Inc. | Method and apparatus for wireless communication employing aggregation for digital signals |
| US6246878B1 (en) * | 1997-11-26 | 2001-06-12 | Telefonaktiebolaget Lm Ericsson | Magnetoresistive device having a highly smooth metal reflective layer |
| CA2311687A1 (en) * | 2000-06-06 | 2001-12-06 | Michael Stumm | Call progress management |
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| US6553016B1 (en) * | 1999-12-20 | 2003-04-22 | Telfonaktiebolaget Lm Ericsson (Publ) | Downlink power control at soft handover |
| CN1368829A (en) * | 2001-02-08 | 2002-09-11 | 华为技术有限公司 | Channel soft-switching method for global mobile communication system |
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| CN1954631A (en) | 2007-04-25 |
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