CN1305669A - Signal decoding with or without second synchronization word in mobile communication system - Google Patents
Signal decoding with or without second synchronization word in mobile communication system Download PDFInfo
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- CN1305669A CN1305669A CN99806216A CN99806216A CN1305669A CN 1305669 A CN1305669 A CN 1305669A CN 99806216 A CN99806216 A CN 99806216A CN 99806216 A CN99806216 A CN 99806216A CN 1305669 A CN1305669 A CN 1305669A
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- mobile radio
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0602—Systems characterised by the synchronising information used
- H04J3/0605—Special codes used as synchronising signal
Abstract
A time division multiple access (TDMA) radio communication system (100) accommodates signal decoding by a mobile station (130) with and without a second synchronization word (214). The radio communication system includes at least one base station (102, 104) to transmit radio signals during a succession of time slots (202, 204, 206) including a current time slot (202) and a subsequent time slot (204). The radio signals include an indication of whether transmission of the subsequent time slot is guaranteed. The system further includes at least one mobile station to receive the radio signals in accordance with the indication.
Description
Relevant application
This part non-provisional application requires the priority of provisional application 60/085,710, and the submission date is on May 15th, 1998, and the obligee is Paul W.Dent and Krister Raith.
Background of invention
The present invention relates generally in mobile radio communicaltions system, send and received signal.Particularly, the present invention relates in mobile radio communicaltions system, in the selected time cycle, will transmit from the base station of system and hang up signal decoding.
In time division multiple access (TDMA) wireless communication system, each transmitter in the system is designated or distribute a time slot to be used to send wireless signal.Every other transmitter is static during this time slot, makes appointed receiver clearly to receive radio signals.If radio communications system is a two-way mobile system, cellular radiotelephone system for example, radio carrier frequency in first frequency band is divided into time slot, be used for from the base station to the communication of a plurality of mobile radio stations, and the radio carrier frequency in second frequency band is divided into time slot, is used for the communication from the different mobile radio stations of a plurality of mobile radio stations to the base station.Base station and the mobile station communicate in the fixing geographic area of close base station, the mobile radio station of other adjacent base station services in adjacent domain.
During some time slot, the base station sends control and time sequence information.This information comprises, for example, the identity of the specified mobile radio station of the calling that receives on the liaison channel and on synchronous or Sync channel synchronously and timing information.Mobile radio station in system receives synchronizing channel, and utilizes information in synchronizing channels that it is regularly regularly synchronous with the base station.Usually, each time slot also comprises known data pattern, is convenient to phase place and amplitude that mobile radio station is estimated channel, and this decoding for the symbol that is sent in the time slot is useful.
Current time slots to bring into use synchronization character and use synchronously (Sync) word to improve receiving the decode of symbol in the end of the beginning of next time slot and current time slots be known.Because the decline on channel or other disturb, current or first synchronization character may not received reliably.By the sample of signal storage that comprises second synchronization character that will receive, can utilize first or second synchronization character or both sample of signal decodings to being stored.This technology was described in United States Patent (USP) 5,335, in 250, is presented in Dent etc. and the United States Patent (USP) 5,841,816 on August 2nd, 1994, was presented to Dent etc. on November 24th, 1998.These two parts of patents and the application are commonly assigned to applicant of the present invention, and are incorporated in this as a reference.Some mobile radio station is using at present, and they rely on reception second synchronization character for the performance of the best.
In some mobile radio system, propose when time slot is not assigned with, will comprise that the message transmission of synchronization character is hung up or change.If time slot is not assigned with, does not then have mobile radio station at present and use this time slot.This may cause the phase place by the base station transmission, and amplitude or direction change with respect to current time slot in follow-up time slot, do not utilize the present invention, and this may reduce the operation conditions of existing mobile radio station.Yet, wish to avoid by base station transmission information in unappropriated time slot, to be reduced in the surrounding area interference to receiver.The transmission of eliminating synchronization character and other information during unallocated time slot will reduce or eliminate the interference of this cochannel, improve the overall performance in the radio system.Because removed the ability that mobile radio station utilizes second synchronization character, this improvement is subjected to reducing the threat of quality.
Receive the mobile radio station that second synchronization character improves communication for dependence, if unappropriated time slot permission time slot allocation to mobile radio station, is then eliminated synchronization character or aspect characteristic, as the sequential of transmitting in the unappropriated time slot, the variation of phase place or direction will have problems.Mobile radio station can not be successfully to channel-decoding, perhaps may be for searching for the time of the second synchronization character overspending.Therefore, need a kind of method and apparatus, be used for providing elimination not reduce the performance of all the other time slots by some time slot of base station transmits at mobile radio communicaltions system.
The summary of accompanying drawing
Fig. 1 is a kind of block diagram of wireless communication system;
Fig. 2 is the sketch of explanation communication format in the wireless communication system of Fig. 1;
Fig. 3 is the flow chart that a kind of method of the radio communications system base station that is used for application drawing 1 is described;
Fig. 4 is the flow chart that a kind of method of the wireless communication system first kind mobile radio station that is used for application drawing 1 is described; With
Fig. 5 is the flow chart that a kind of method of the wireless communication system second type mobile radio station that is used for application drawing 1 is described.
Present DESCRIPTION OF THE PREFERRED
With reference now to accompanying drawing,, Fig. 1 illustrates a kind of wireless communication system 100, comprises at least one base station 102,104 and at least one mobile radio station 130.Wireless communication system 100 can be any two-way radio communications system, cellular radiotelephone system for example, and PCS Personal Communications System (PCS), trunked radio system, or other.In the embodiment illustrated, wireless communication system 100 is the cellular radiotelephone systems according to the interim standard I S-136 operation of being announced by telecommunication industrial combination meeting/Electronic Industries Association (TIA/EIA).
In Fig. 1, come illustrative system 100 with two base stations, comprise base station 102 and base station 104.Usually, all base stations are disposed similarly, will describe the structure and the operation of base station together with base station 102.The base station that comprises the system of base station 102 and base station 104 is linked at forms a network together.This network is by mobile switching centre (MSC) 106 controls.MSC 106 is by the land route circuit, and telephone link or Radio Link are linked each base station 102,104.The operation of the whole network of MSC 106 control is provided to the connection of public switch telephone network (PSTN) and the mutual operation of control base station, so that provide, and the function of delivering of the radio communication between two base stations and the single mobile station in system 100 for example.
Transmitter 112 utilizes antenna 120 to send radio signals to mobile radio station, for example at the fixing mobile radio station 130 in the geographic region around the base station 102.Transmitter 112 can comprise for example coding, the function of inserting and modulating.The radio signal that receiver 114 will receive on antenna 120 is converted to numerical data and uses for base station 102.Receiver can comprise as filtering, the function of demodulation sign indicating number.Memory 116 storage data and instruction are used for operation control 110 and are used by other circuit in the mobile radio station 102.
It will be apparent to one skilled in the art that base station 102,104 can comprise other functions and other circuit equally.These functions comprise the calling startup of management and utilization mobile radio station and utilize mobile radio station to deliver to communicating by letter of another base station from a base station.
Mobile radio station 130 is models of the mobile radio station that can move in radio communications system 100.Mobile radio station can be any can with the radio of remote base station two-way wireless communication, for example cell phone, pcs telephone or other two-way radio.In the embodiment illustrated, mobile radio station 130 is can be according to the mobile phone of IS-136 operation.Mobile radio station 130 in the embodiment illustrated comprises antenna 132, RX path 134, transmit path 136, controller 138, memory 140, user interface 142, battery 144, clock 146 and synthesizer 148.
The digital data conversion that transmit path 136 will be produced by controller 138 is a radio signal, is used to utilize antenna 132 to send.Transmit path 136 comprises encoder 160, modulator 162 and transmitter 164.Encoder 160 will become the form that signal post needs in the system 100 that comprises insertion by the digital data coding that controller 138 provides.Coded data is provided for modulator 162, the carrier signal of utilizing data-modulated to be provided by synthesizer 148.Modulated carrier is provided for transmitter 164, and function such as power amplification and filtering are provided.Then, the carrier wave that has amplified is applied to antenna 132 for sending to remote base station, as base station 102,104.
The general function of controller 138 control mobile radio stations 130.Controller 138 is preferably as microcontroller, digital signal processor, or their combination, and respond and operate being stored in data in the memory 140 and instruction.User interface 142 allows to control mobile radio station by the user, comprises keyboard in typical case, microphone, loud speaker and display.Battery 144 provides the operation power of mobile radio station 130.Clock 146 provides regularly for the circuit of mobile radio station 130.Particularly, clock 146 provides timing signal to use for controller 138, makes to comprise that the mobile radio station 130 of controller 138 can be still synchronous with the remainder of communication system 100.
In the embodiment illustrated, wireless communication system 100 is time division multiple access (TDMA) wireless communication systems.Just, in system 100, each mobile transmitter in system, when being activated, designated or distribution time slot is used to send wireless signal.Every other in same cellular, utilizing other mobile transmitters of same frequency is static during this time slot.Make the receiver of appointment can clearly be received in the radio signal on the channel.Certainly, in another honeycomb or another frequency, other mobile radio stations can use identical time slot independently.
An example of TDMA radio communications system is the mobile telephone system according to interim standard I S-136.The IS-136 regulation has the communication frame of six time slots, yet, become full speed channel by paired assign group usually.Therefore full speed channel is actually three time slot tdma systems.By with time slot on the upstream frequency and the combination of the time slot on the downstream frequency, set up a duplex channel and be used between base station and particular mobile station, setting up two-way communication.
Fig. 2 illustrates communication format in Fig. 1 wireless communication system.Fig. 2 illustrates the part of the communication frame 200 that comprises three time slots, first time slot, 202, the second time slots 204 and the 3rd time slot 206.Time slot 202,204,206 are all sent by the base station in the system 100 of Fig. 1.
Each time slot comprises synchronization character.Therefore first time slot 202 comprises that synchronization character 212, the second time slots 204 comprise that synchronization character 214 and the 3rd time slot 206 comprise synchronization character 216.Synchronization character or Sync (synchronously) word is included in the data pattern of predesignating in the position of predesignating that begins near each time slot.Synchronization character is used for synchronization timing and the slot decoder to being sent by receiving mobile radio station.
Each time slot receives by sending the single mobile station of base station regulation for neighbor base station with the synchronization character relevant with it.Yet in current IS-136 system, three all time slots are sent out all the time, so the mobile radio station that is prescribed can receive other time slots, and for example follow-up time slot and be prescribed the better time slot of time slot than it.In IS-136, the contrary symmetry of transport format table emersion time makes that mobile radio station can be from first synchronization character its information of demodulation or from second synchronization character backward forward.Yet in the system in future, when not having data to send, time slot can be omitted.Being reduced to the interference of non-appointment receiver, but deprived the right of the appointed second synchronization character receiver.
Utilizing the synchronization character of current time slots and follow-up time slot to improve by mobile radio station receives and is known to the decoding of symbol.This technology was described in U.S. Patent No. 5,335, in 250, is presented in Dent etc. and the U.S. Patent No. 5,841,816 on August 2nd, 1994, was presented to Dent etc. on November 24th, 1998.These two parts of patents and the application are commonly assigned to applicant of the present invention, are incorporated in this as a reference.These decoding technique or other suitable decoding techniques that are introduced into reference are referred to herein as first decoding algorithm or technology.According to the embodiment that is disclosed at present, in the time of can not guaranteeing to send synchronization character in follow-up time slot in the base station, mobile radio station will use second decoding algorithm or technology.
According to decoding and the demodulation techniques described in the reference of introducing, mobile radio station receives the time slot in designated or tdma frame cycle being assigned with.Utilize first decoding algorithm, mobile radio station is by means of the known symbol that is called first synchronization character, these symbols near the institute distributed time slot begin send and decode to the received signal at the known symbol that begins to send near subsequent timeslot by means of being called second synchronization character.Alternatively narration, base station send first data symbol of predesignating and unknown data symbol.Synchronization character or other known data pattern are formed first data symbol of predesignating.For the specific data of particular mobile station appointment are unknown data symbols.Unknown data symbol can be encoded as speech data, control data or other data.In some system, the base station sends second data symbol of predesignating, for example second synchronization character in follow-up time slot.
In some system, at the known symbol of the beginning of subsequent timeslot, for example, second synchronization character is not guaranteed to be sent by the base station.This can be implemented, and for example, is reduced in the co-channel interference of receiver in the peripheral region.If follow-up time slot is not assigned to the mobile radio station of base station, during assigned slot not, transmission can be hung up in the base station, comprises synchronization character, to reduce co-channel interference.Another kind of scheme is, directional antenna can be used in the base station, and allowing the broadcasting of time slot to enter by the base station provides in the specific sector in a zone of service.This sector can be different with the sector at the mobile radio station place that is assigned with current time slots.Therefore, because the change of beam direction, second time slot can not coherently be received with front time slot data.
Because these possibilities, base station can not guarantee transmission second data symbol of predesignating, for example synchronization character in subsequent timeslot.And, send second data symbol of predesignating, if take place, the sequential of subsequent timeslot or phase place or amplitude have been changed by the base station basically because of any specific reason, then can not be useful.Because the synchronization character that is used by mobile radio station is used for its sequential and reception are synchronized to the base station, any variation in these parameters can cause synchronization loss and mobile radio station need be synchronized to the base station again.
Work as known symbol, synchronization character for example, beginning at subsequent timeslot is not guaranteed to be sent by the base station, perhaps be not guaranteed and being transmitted in regularly in current time slots, phase place, during the continuity of amplitude or direction, offer signal of mobile radio station according to base station of the present invention, indicating second synchronization character can not be relied on.Alternatively narration, when the transmission of second data symbol of predesignating was not guaranteed, the base station sent an indication.
The data symbol that mobile radio station utilization at least the first is predesignated is to the transmission decoding from the base station.If it is reliable that the signal that is sent by the base station indicates the transmission of second data symbol of predesignating or second synchronization character, mobile radio station will utilize first data symbol of predesignating, second data symbol of predesignating or both, the disclosure that foundation " first " algorithm is merged in is to the slot decoder that receives from the base station.Can use any suitable algorithm in the reference that is merged in, described or other.
When mobile radio station receives indication, when second data symbol of predesignating or second synchronization character can not be relied on, mobile radio station utilized second decoding algorithm, to the signal decoding that receives in selected time slot.The known symbol that second decoding algorithm only need be sent out in selected time slot.This second decoding algorithm can be above introduce with reference to described in any modification, as long as when the indication that second synchronization character can not quilt be relied on is held, by with the constant mass of second synchronization character be set to minimum mass value and implement.Any other decoding algorithm that is fit to also can be used, and only uses a guaranteed synchronization character.
Therefore when indication is sent out, mobile radio station utilizes the decoded symbol data of first data symbol of predesignating to the unknown, when the nothing indication is sent out, utilize first data symbol of predesignating and second data symbol of predesignating decoded symbol data to the unknown.Indication can be included in by the base station and send to any suitable data or signal in the control signal information of mobile radio station.In one embodiment, send indication at call setup or during delivering.When being activated, two-way communication produces call setup between mobile radio station and base station.The user wishes to export calling or bid startup when the incoming call that proceeds to mobile radio station has been signaled in the base station on the liaison channel when mobile radio station indicates.When mobile radio station is delivered during from first base station overlay area to second base station overlay area.When both of these case took place, basic control information exchanged between mobile radio station and base station.
In one embodiment, the base station is to all the mobile radio station broadcasting indications in its area of coverage or the sector at its area of coverage.This can utilize the Broadcast Control Channel (BCCH) that is called digital control channel or DCC to realize.This indication notice mobile radio station, the operator scheme of the availability that does not guarantee second synchronization character is being used in the base station.In response, in the sector or all mobile radio stations of the area of coverage use second decoding algorithm.
In another embodiment, mobile radio station provides a kind of indication to the base station, and mobile radio station needs second synchronization character for the gap information the best from the base station is decoded.This is suitable for the compatibility with the mobile radio station with this requirement.According to this embodiment, mobile radio station sends a pointer, and this pointer indicates mobile radio station need send second data symbol of predesignating.This pointer is responded, also send second data symbol of predesignating when free of data transmits according to base station of the present invention even in following time slot reliably.Second synchronization character is not hung up in the base station, does not change transmission phase place and amplitude or any other necessary characteristic, but can omit the transmission of following the data behind second word, if there are not data to be sent out.
Pointer can comprise the data pattern of predesignating or be used for a kind of operational mode pointer of mobile radio station.This pointer can send to the base station with the control information that is provided by mobile radio station.
Another kind of scheme is that pointer can be comprised in by mobile radio station and send in the standard information of base station.For example, each mobile radio station has protocol version, and between communication is sent to the base station when starting.Protocol version relates to standard, IS-136 for example, the modification of the standard that mobile radio station is using.Whether as the response to protocol version or any other similar pointer, the base station can determine, wait in expectation second synchronization character or can be moved reliably and do not send second synchronization character of mobile radio station.And one of these two kinds of operational modes can be set to a standing value and have non-standing condition, only according to being selected by suitable the determining in base station.Further, in another embodiment, which mode operation the base station can determine, by utilizing a kind of identifier, for example the electronics string number (ESN) of the mobile radio station that is sent by mobile radio station during call setup reaches.ESN by will being used for mobile radio station with in the base station or other local memories of communication network value of storing make comparisons, the base station can discharge the characteristic of this mobile radio station from customer data base, comprises which operator scheme provides for this mobile radio station.Therefore, the base station is identified for the transmission requirement of mobile radio station and sends second data symbol predesignate, and the transmission requirement of mobile radio station is responded.
Fig. 3 is with the flow chart that explains the method for the base station operation in the wireless communication system 100 of Fig. 1.This method is in step 302 beginning, and in step 304, the base station determines whether that mobile radio station (MS) needs second synchronization character.This definite can carrying out according to any suitable method, for example pass through from mobile radio station received signal information, comprise a kind of implicit pointer, indicating mobile radio station needs second synchronization character, perhaps receives identifier or other information and the identifier and the data of being stored are made comparisons to determine the transmission requirement of mobile radio station from mobile radio station.In the embodiment depicted in fig. 1, the controller 110 of base station 102 is formed a kind of device, is used for the type of a kind of particular mobile station of definite and base station radio telecommunication.Controller 110 can be for this purpose with memory together with operation, perhaps together with other data processing equipments of system, for example MSC 106 operations.
Need second synchronization character if the base station is determined mobile radio station, in step 306, the base station sends first time slot that comprises first synchronization character.In step 308, the base station sends second synchronization character at least.In this way, first data symbol of being predesignated (first synchronization character) and second data symbol of being predesignated (second synchronization character) are provided for mobile radio station, are used for the unknown data symbol exact solution mediation decoding that is sent at first time slot by the base station.In the embodiment of Fig. 1, transmitter 112, separately or together with controller 110, form a kind of device, type to specific mobile radio station responds, be used for when particular mobile station is the first kind, during at least a portion of current time slots and subsequent timeslot, send radio signal to particular mobile station.This method finishes in step 310 then.
If in step 304, the base station determines that mobile radio station does not need second synchronization character, sends first time slot and first synchronization character in step 312 base station.Embodiment about Fig. 1, transmitter 112, form a kind of device separately or together with controller 110, type to particular mobile station responds, be used for during current time slots, sending radio signal to particular mobile station, when particular mobile station was second type, radio signal was fitted to the type of another kind of mobile radio station.Then, in step 314, the base station determines whether second time slot (just followed by the time slot behind first time slot) is assigned with.If the base station is second time slot that utilizes the same wireless radio channel, carry out transmitting and receiving service with second mobile radio station.If this time slot base stations during not with any mobile station communicate, perhaps mobile radio station is assigned to the time slot of different directions, second or follow-up time slot during transmission can be suspended or change.If second time slot is assigned with, in step 316, the base station will send second time slot and second synchronization character, and this is that the mobile radio station that distributed of second time slot is needed.
If in step 314, the base station determines that second time slot is not assigned with, in step 318, the base station has determined whether to need to change its wireless radio transmission.For example, if second time slot has been assigned to the different sectors that are positioned at by the geographic area of base station services, then will there be a kind of like this needs.If do not need to change, control proceeds to step 316, sends second time slot and second synchronization character.Yet, change if desired, in step 320, necessary change is done in the base station aspect transmission, in step 322, send next time slot.This method finishes in step 310.
Fig. 4 flow chart of a kind of method that explains the wireless communication system first kind mobile radio station that is used for service chart 1.Second synchronization character that first kind mobile radio station needs or expectation is sent by the base station.This method begins in step 402.
In step 404, mobile radio station still is in the loop, attempts to locate a control transmission from base station (BS).Be not positioned if there is suitable transmission, mobile radio station continues search.Mobile radio station can be attempted to start calling by the beginning and the transmitting and receiving service of base station, perhaps can attempt to deliver from first base station second base station of communicating by letter to and being positioned.
In the content of Fig. 1, RX path 134 is formed a kind of device, is used to receive the decode from remote signal of base station.AFE (analog front end) 150, demodulator 152 and decoder 154 are adapted to carries out these functions.The design of these circuit and realization comprise hardware and software, and optional embodiment, are described in more fully in the reference material of introducing.Indicating base station transmits by new signal-arm provided by the invention is the first kind or second type.The transmission of the first kind comprises symbol, and the synchronization character in subsequent timeslot for example, mobile radio station 130 can be used for the transmission decoding to the base station.The base station transmits of second type does not comprise second synchronization character reliably.Decoder 154 with controller 138 combination, is formed a kind of device, and indication is responded, be used for to tdma frame cycle institute's distributed time slot from the base station 102,104 communication signal decodings that receive.Decoder 154 and controller 138 can be used as the hardware of these functions of execution or any combination of software suitably realizes.
In one embodiment, in case a base station is positioned, determine informing base station at step 406 mobile radio station, it needs second synchronization character to reach optimum performance.In other embodiment, possible generation step 406 no special enforcements.And software or the operation of other program control mobile radio stations can be carried out next step simply, and this depends on the operational mode of mobile radio station.
If mobile radio station does not need second synchronization character, it can send a pointer in step 408.As mentioned above, pointer can be data or be included in signal, for example other information in the control signal.Control signal for example can be, electronics string number (ESN) or mobile identifier (MIN) are belonged to mobile radio station uniquely.Pointer indicates the type of mobile radio station to the base station.Determine successively whether the base station need be sent to the second predetermined data symbol in the time slot of distributing to it in follow-up time slot.Another kind of scheme is that pointer can be a kind of specific grade mark or protocol version, is sent to the base station and is used for determining that by the base station mobile radio station need transmit second synchronization character.Further, mobile radio station can only send identifying information, and for example a kind of identifier that is similar to electronics string number is used for determining the transmission requirement of mobile radio station then by the base station.
In step 408, mobile radio station receives first time slot that is sent by the base station and receives the 2nd Sync word at least.In step 410, mobile radio station by means of second synchronization character to the first time slot demodulation.More generally, any decoding technique of mobile radio station utilization described in the above reference that is introduced into, or any other proper technology is to the first time slot demodulation sign indicating number.Mobile radio station determines whether that in step 412 more time slot at hand or call out and to stop.Continue if call out, step 408 is got back in control.Stop if call out, method finishes in step 416 so.
Fig. 5 is with the flow chart of the method that explains a kind of wireless communication system second type mobile radio station that is used for application drawing 1.The mobile radio station of second type does not also require or expects and send second synchronization character by the base station.Yet in one embodiment, if second synchronization character can be used, the mobile radio station of second type utilizes second synchronization character to make its performance be the best.This method begins in step 502.The similar step 404 of step 504 is as described above together with the situation of first kind mobile radio station.In step 506, mobile radio station sends a pointer, illustrates that second synchronization character can be omitted.
If mobile radio station does not need second synchronization character, in step 508, whether the mobile radio station of second type can receive indication from the base station, available about second synchronization character.In step 510, mobile radio station receives and comprises until first time slot of second synchronization character.In step 512, mobile radio station inspection whether second synchronization character has indicated and can obtain or useful.If, mobile radio station proceeds to step 514 and utilizes first and/or second synchronization character to use first demodulating algorithm.If not, mobile radio station proceeds to step 516, and utilizes second algorithm only to adopt the first synchronization character demodulation, first time slot.In step 518, carry out soft decision from the first follow-up time slot and whether utilize first algorithm to carry out demodulation in step 516 then, go to insert and decoding in the step 514 or second algorithm.
If in step 520, calling will continue, and turn back to step 510 and receive next first time slot.Alternatively, control turns back to step 508, if indicating the second synchronization character availability, each time slot is provided, otherwise, stopping if call out, this method finishes in step 522.
From the above, the embodiment shown in can seeing provides a kind of method and apparatus, is used for adapting in elimination or the modification of mobile radio communicaltions system by some synchronization character of base station transmission.The base station is sent to a kind of indication the mobile radio station in the zone of being served by the base station, and the transmission of follow-up synchronization character will be suspended or change, thereby is insecure.In a kind of optional embodiment, mobile radio station can send a kind of pointer to the base station, and mobile radio station needs second synchronization character, and in this case, the base station will continue to send second synchronization character and use for mobile radio station.
These embodiments allow to dispose improved base station, use more advanced directional antenna array, can send the different time-gap in tdma frame cycle in different directions, are adapted to the position of specified receiver.Another kind of scheme is, allows to use adaptive power control, and transmit power levels can be increased or reduce in the time slot therein, depends on the distance of appointed receiver.The characteristic of these two variable effect second synchronization characters.Embodiment shown in the utilization, these advanced base stations can be adapted to and send to former time slot with having successional second synchronization character of signal, to keep and to rely on with reviewing the compatibility of the mobile station receiver of second synchronization character.
Though a kind of specific embodiment of the present invention is shown and described, still can make an amendment to it.For example, the synchronization character that is sent out in each time slot is illustrated, and when being used for the demodulation sign indicating number from the transmission of base station for mobile radio station, any data of predesignating or symbol that is included in the time slot can be used by mobile radio station.Therefore look to covering in the appended claims all such changes and the modification of following real spirit and scope of the present invention.
Claims (25)
1. method that is used to operate the wireless communication system that comprises at least one base station and at least one mobile radio station, this method may further comprise the steps:
In the base station, send first data symbol of predesignating and unknown data symbol;
In the base station, send second data symbol of predesignating selectively;
In the base station, when transmission second data symbol of predesignating is not guaranteed, send a kind of indication;
At mobile radio station, utilize at least the first data symbol of predesignating to transmission demodulation from the base station.
2. the process of claim 1 wherein that the decoding transmission may further comprise the steps:
When indication is sent out, only utilize the decoded symbol data of first data symbol of predesignating to the unknown; With
When the nothing indication is sent out, utilize one of at least the first data symbol of predesignating and second data symbol of predesignating, to the decoded symbol data of the unknown.
3. the process of claim 1 wherein that first data symbol of predesignating comprises the synchronization character that is used for current time slots.
4. the process of claim 1 wherein that second data symbol of predesignating comprises the synchronization character that is used for follow-up time slot.
5. the process of claim 1 wherein that sending indication comprises:
In the base station,, when the transmission of synchronization character is hung up in the base station, send this indication when during follow-up time slot.
6. the process of claim 1 wherein that sending indication comprises:
When the base station can not guarantee with any reliable sequential, phase place reliably during data symbol that amplitude and direction continuity transmission reliably second reliably predesignated, sends this indication.
7. the method for claim 1 further may further comprise the steps:
At mobile radio station, send a kind of pointer, this pointer indicates the mobile radio station expectation and sends second data symbol of predesignating; With
In the base station, this pointer is responded, send second data symbol of predesignating reliably.
8. the method for claim 7, wherein this pointer comprises the data pattern of predesignating.
9. the method for claim 7, wherein pointer comprises the operator scheme pointer that is used for mobile radio station.
10. the method for claim 7, wherein this pointer comprises a kind of identifier that is used for mobile radio station and further may further comprise the steps:
In the base station, identifier is responded, be identified for the transmission requirement of mobile radio station; With
The transmission requirement that is used for mobile radio station is responded, send second data symbol of predesignating.
11. the method for claim 10 wherein sends requirement and is retrieved out from customer data base.
12. the mobile radio station that can work and be configured to receive from remote base station the first kind and second type transfers in wireless communication system, this mobile radio station comprises:
Be used for receiving and signal demodulation device from remote base station, it is the first kind or second type that this signal indicates base station transmits; With
Signal responded, and to be used for when indicating the base station be first kind when transmission, by means of in follow-up time slot from symbol that the base station sent, in time division multiple access (TDMA) frame period institute distributed time slot, to the communication signal decoding that receives from the base station, when indication indicates base station second type transfers, do not rely on the symbol that is sent in the follow-up time slot that is not assigned with, to the communication signal decoding in time slot.
13. one kind can and be configured to from the mobile radio station of the remote base station reception first kind and second type transfers in wireless communications station work, transmission being arranged in a plurality of continuous time slot, and mobile radio station comprises:
The receiver that is configured to receive transmission and produces the data that this is responded, data comprise a kind of indication, indication has first value when transmission is the first kind, is second value when transmission is second type; With
A kind of circuit of linking receiver, when indication had first value, the data that are configured to be used to from current time slots were decoded to data, when indication has second value, were configured to be used to from current time slots and subsequent timeslot data are decoded.
14. the mobile radio station of claim 13 further comprises:
Be used to transmit a signal to the transmitter of remote base station; With
Be configured the paired data format for the circuit that is sent to remote base station, data comprise a pointer, and the base station is indicated whether mobile radio station is accepted first kind transmission.
15. the mobile radio station that can work in the wireless communication system that comprises one or more base stations that send during continuous time slot, this mobile radio station comprises:
A decoder is configured to a kind of indication of identification in from the transmission of one or more base stations, indicates whether follow-up time slot can be relied on for receiving; With
A demodulator, be used for according to one of first algorithm that meets with indication and second algorithm during current time slots to transmission demodulation from one or more base stations.
16. the mobile radio station of claim 15, wherein decoder is configured to be identified in the indication in the data that receive in one or more base stations.
17. the mobile radio station of claim 16, wherein decoder is configured to identification indication from the data that one or more base stations receive between the two-way communication starting period between mobile radio station and one or more base station.
18. the mobile radio station of claim 15, wherein decoder is configured to identification indication in time slot in succession.
19. the mobile radio station of claim 18, wherein decoder is configured to during continuous time slot, and measurement is from the characteristics of signals of the transmission of one or more base stations with by identification indication that characteristics of signals and the threshold value of predesignating are made comparisons.
20. a base station that is configured to work in wireless communication system, base station are used for transmitting a signal to one or more mobile radio stations a geographic area of predesignating, mobile radio station is one of the first kind and second type, and the base station comprises:
The device that is used for the type of a definite particular mobile station of communicating by letter with base station radio; With
To the device that the type of particular mobile station responds, be used for sending:
(a) when particular mobile station is the first kind, in current time slots with at least during the part of subsequent timeslot, to the radio signal of particular mobile station; With
(b) when particular mobile station is second type, during current time slots to the wireless signal of particular mobile station be adapted to the wireless signal of another mobile radio station type.
21. the base station of claim 20, the device that wherein is used to determine comprise a circuit, this circuit is used for determining according to the transmission on the mobile radio station type of specific mobile radio station.
22. the base station of claim 20, the device that wherein is used to send adopts wireless signal, this signal is the change of the power level that transmits in the follow-up time slot, the change of the phase place of in follow-up time slot, transmitting, the variation of transmission timing in follow-up time slot, the variation of transmission direction in follow-up time slot, one of change of the change of transmission modulation and the burst format of in follow-up time slot, transmitting.
23. a time division multiple access (TDMA) radio communications system comprises:
At least one base station sends wireless signal during time slot arrives continuously, this time slot comprises current time slots and follow-up time slot, and wireless signal comprises a kind of whether follow-up time slot sends guaranteed indication;
At least one mobile radio station receives radio signals according to this indication.
24. the TDMA radio communications system of claim 23, wherein at least one mobile radio station comprises a kind of circuit when indicating follow-up slot transmission and be guaranteed, utilizes information in current time slots and the information in the subsequent timeslot that wireless signal is decoded.
25. the TDMA radio communications system of claim 23, wherein at least one base station comprises a kind of circuit, be used for indicating from least one the particular mobile station received signal of mobile radio station of the type of specific mobile radio station, mobile radio station is a kind of the needs to guarantee the type that subsequent timeslot transmits and do not need to guarantee one of type of subsequent timeslot transmission.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US8571098P | 1998-05-15 | 1998-05-15 | |
| US60/085710 | 1998-05-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1305669A true CN1305669A (en) | 2001-07-25 |
Family
ID=22193450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99806216A Pending CN1305669A (en) | 1998-05-15 | 1999-05-13 | Signal decoding with or without second synchronization word in mobile communication system |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP1086541A1 (en) |
| JP (1) | JP3530135B2 (en) |
| KR (1) | KR20010071268A (en) |
| CN (1) | CN1305669A (en) |
| AU (1) | AU3903099A (en) |
| HK (1) | HK1038843A1 (en) |
| WO (1) | WO1999060737A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100655417B1 (en) * | 2005-06-08 | 2006-12-08 | 임재성 | Virtual slot multiple access scheme for data communication |
| CN102106150A (en) | 2009-02-05 | 2011-06-22 | 松下电器产业株式会社 | Imaging processor |
| US9204409B2 (en) | 2010-02-22 | 2015-12-01 | Samsung Electronics Co., Ltd. | Method and apparatus for device synchronization and power conservation in a wireless communication system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2739978C2 (en) * | 1977-09-06 | 1982-06-16 | TE KA DE Felten & Guilleaume Fernmeldeanlagen GmbH, 8500 Nürnberg | Synchronization procedure for time division multiplex systems |
| US4847877A (en) * | 1986-11-28 | 1989-07-11 | International Business Machines Corporation | Method and apparatus for detecting a predetermined bit pattern within a serial bit stream |
| US5841816A (en) | 1992-10-22 | 1998-11-24 | Ericsson Inc. | Diversity Pi/4-DQPSK demodulation |
| US5335250A (en) | 1992-10-22 | 1994-08-02 | Ericsson Ge Mobile Communications Inc. | Method and apparatus for bidirectional demodulation of digitally modulated signals |
-
1999
- 1999-05-13 JP JP2000550232A patent/JP3530135B2/en not_active Expired - Fee Related
- 1999-05-13 CN CN99806216A patent/CN1305669A/en active Pending
- 1999-05-13 KR KR1020007012820A patent/KR20010071268A/en not_active Application Discontinuation
- 1999-05-13 AU AU39030/99A patent/AU3903099A/en not_active Abandoned
- 1999-05-13 EP EP99921952A patent/EP1086541A1/en not_active Withdrawn
- 1999-05-13 WO PCT/US1999/010603 patent/WO1999060737A1/en not_active Application Discontinuation
-
2002
- 2002-01-15 HK HK02100307.6A patent/HK1038843A1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| KR20010071268A (en) | 2001-07-28 |
| JP2002516518A (en) | 2002-06-04 |
| AU3903099A (en) | 1999-12-06 |
| EP1086541A1 (en) | 2001-03-28 |
| JP3530135B2 (en) | 2004-05-24 |
| WO1999060737A1 (en) | 1999-11-25 |
| HK1038843A1 (en) | 2002-03-28 |
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