CN1205814A - Digital telephone using control messages transmitted in time slots for RF frequency allocation - Google Patents
Digital telephone using control messages transmitted in time slots for RF frequency allocation Download PDFInfo
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- CN1205814A CN1205814A CN 96199295 CN96199295A CN1205814A CN 1205814 A CN1205814 A CN 1205814A CN 96199295 CN96199295 CN 96199295 CN 96199295 A CN96199295 A CN 96199295A CN 1205814 A CN1205814 A CN 1205814A
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Abstract
In a system in which control messages are transmitted in predetermined time slots within fixed length time frames from a first transmitting and receiving unit to a second transmitting and receiving unit, the second unit listens on a selected RF carrier frequency for an incoming message, the selected RF carrier frequency being selected from the class of RF frequencies available and preferred for use, the RF frequencies being classified dependent on whether communications on previously selected carrier frequencies have been successful.
Description
The present invention relates to the transmission of numerical data and control messages in the predetermined time slot in the fixed length time frame.
The present invention relates in a kind of predetermined time slot in the fixed length time frame control messages is transferred to from first unit of transmission and reception method of second unit of transmission and reception, this control messages is used to control Unit second, this Unit second comes the message of " listening to (listen) " input with the RF carrier frequency of selecting when waiting for reception, selected RF carrier frequency is to select from the RF frequency class of available and override use, and this RF frequency is classified according to the communication success or not on the carrier frequency of formerly selecting.
Best, the carrier radio frequency that is assigned to first module is classified into preferential use (preferred for use), inferior preferential use (less preferred for use), the poorest preferential use (least preferred for use).If can not select the preferential RF carrier frequency that uses, then will select time preferential RF carrier frequency that uses.Can not select if be categorized as time the preferential RF carrier frequency that uses, then second unit scan is assigned to all RF carrier frequency of the network of Unit first and second, determining to can be used for the RF carrier frequency by the first module transmission, and " listens to " with this frequency.
Unit second is subscriber unit preferably, and first module base station preferably.Preferably adopt wireless transmission.Best " listening to " call setup request in Unit second or short message.When having a plurality of Unit second when being used for communicating with first module, each Unit second is carried out the classification of carrier radio frequency, for example, specific radio frequency can preferentially be used for being communicated by one second unit, communicates but be not used in by another Unit second.
The invention still further relates to correlation method, the receiver of receiving digital data signal and comprise first module and the communicator of a plurality of Unit second.
The preferred embodiments of the present invention are described below with reference to accompanying drawings by way of example, in the accompanying drawing:
Fig. 1 is the schematic diagram that expression comprises the system of base station (BTE-Base Terminating Equipment:BTE-base station terminal equipment) and subscriber unit (NTE-Network Terminating Equipment:NTE-network-termination device);
Fig. 2 is the frame structure of expression duplex link and the schematic diagram of sequential;
Fig. 3 is the schematic diagram of expression from time slot table (slot-list) message of base station.
Fundamental system
As shown in Figure 1, this optimum decision system is the part of telephone system, and wherein the part from the switch to user has line loop to be substituted by the full duplex radio link between fixed base stations and the fixed subscriber unit.This optimum decision system comprises the duplex wireless link and is used to implement the transmitter and receiver of necessary agreement.This optimum decision system with in the art known digital cellular mobile telephone system such as GSM similarity is arranged.This system adopts the agreement based on hierarchical mode, specifically adopts a kind of hierarchical mode that has as lower floor: PHY (physical layer), MAC (media access control layer), DLC (data link control layer), NWK (network layer).Compare with GSM, a difference is: in this optimum decision system, subscriber unit is positioned at the place, fixed position, does not need handover (hand-off arrangement) and the further feature relevant with mobility.This means, for example, in this optimum decision system, can adopt directive antenna and civil power.
Each base station in this optimum decision system is equipped with 6 duplex wireless links with 12 frequency operations selecting from whole Frequency Distribution, thus the interference minimum between near the base station making.The frame structure and the sequential of this duplex link are shown among Fig. 2.Each duplex wireless link includes the up link from the subscriber unit to the base station, and the down link from the base station to the subscriber unit with fixed frequency skew.Down link is TDM, and up link is TDMA.PI/4-DQPSK is adopted in modulation to all links, and the basic frame structure of all links is that the frame of per 2560 bits is 10 time slots, i.e. 256 bits of each time slot.Bit rate is 512kbps.Down link is transmission continuously, and is provided with the broadcast channel that is used for fundamental system information.When not having user's message transmission, downlink transmission continues to adopt basic frame and structure of time slot, and comprises suitable filling model (fill pattern).
For up link and downlink transmission, have two kinds of time slots: common (normal) time slot, it uses after call setting; And pilot time slot, it uses during call setting.
The common time slot of each down link includes the synchronizing information of 24 bits, is thereafter the S field (it comprises 8 bit heads) of the appointment of 24 bits, is the D field of the appointment of 160 bits after again.After this is the forward error correction and 8 bit tail of 24 bits, is the broadcast channel of 12 bits afterwards.Each broadcast comprises from the section of 10 12 bits of each downlink time slots taking-up.When being assembled into 120 bit message, this broadcast comprises that the data of 104 bits, the forward error correction of 14 bits connect and 2 filling bits (padding bits).In the data of this 104 bit, the Cyclic Redundancy Check of 16 bits is arranged.This broadcast channel is formed by a plurality of sections in each time slot of a frame, the common descending common signaling channel that forms by base station transmits of each section, this broadcast channel also comprises control messages, does not have the operation information necessary that connects (connectionless) message and this system, and this control messages comprises time slot table link information, multiframe and superframe information such as (slot lists).
During call setting, each descending pilot frequency time slot include frequency correction data and/or only have short S field and do not have D field information be used for the initialized training sequence of receiver.
Uplink time slot consists essentially of two kinds of data of different types groupings (data packet).First kind of grouping is called pilot packet, for example is used for the ALOHA call request before connection is set, and carries out the auto-adaptive time calibration.The another kind of type of packet is known as common (normal) grouping, and it is used for when setting up calling, and owing to use the auto-adaptive time calibration, is bigger packet therefore.
The packet of 244 bits on 4 bit duration slopes (ramp) before and after comprising, each up link ordinary groups is respectively arranged.All the other bits of this slope and 256 bit time slots provide guard interval (guardgap), are used to prevent the interference from contiguous time slot (neighbouring slots) that causes owing to the sequential mistake.Each subscriber unit is adjusted the sequential of its slot transmission, arrives the required time of base station with compensating signal.Each up link general data packets comprises the synchrodata of 24 bits, is the S field and the D field of similar number bit afterwards, and this is as the situation of the common time slot of each down link.
Each uplink pilot time slot includes the pilot data grouping, and this pilot data is grouped into 92 bit long, and respectively there are 4 bit slopes front and back, and this slope has defined the guard interval of the expansion of 60 bits.Owing to there is not an available time sequence information, and if do not have it, then propagation delay causes that contiguous time slot produces and disturbs, therefore this bigger guard interval is necessary.This pilot packet comprise 64 bits synchronously, be the S field of 104 bits afterwards, this S field is with 8 bit starts of header (SOH), and finishes with 16 bit cyclic redundancy, 2 reservation bits, 14 FEC bits and 8 tail bits.Here there is not D field.
S field in the above-mentioned packet can be used for two types signaling.First type is MAC signaling (MS), and is used to the signaling between the MAC layer of the MAC layer of base station and subscriber unit, and this moment, sequential was important.Second type is called auxiliary (associated) signaling, and it can slowly can be fast, and is used to the base station in DLC or the NWK layer and the signaling of subscriber unit.
D field is the maximum data field, comprises digitize voice under the situation of common (normal) phone, but also can comprise the non-speech data sample.
As detailed below, in arbitrary access Aloha time slot, carry out call request.Stipulate that in this optimum decision system query-response agreement (challenge responseprotocol) is adopted in subscriber unit mandate (authorisation).Unpredictable sequence by the password bit that produces with voice or data and by key stream generator makes up carries out general encryption, and this key generator is synchronized to the Hyper Frame Number (super-frame number) of transmission.
In addition, the signal of transmission by scrambling to remove the dc component.
Contention protocol (Contention Protocol)
Subscriber unit adopts time slot A loha agreement that call setup request and short message message (datagram) are sent to the base station.With the pilot packet transmission, this Aloha time slot has been designated as and can have obtained in the time slot table by base station broadcast this purpose in a time slot table that is called the Aloha time slot for these requests and message.Typical time slot table broadcasting is shown among Fig. 3.The time slot table comprises that to one 16 labels are that the multi-frame (multiframe) of 0～15 successive frame is effective, and it is broadcasted in a multi-frame, to be applied to next multi-frame.The number of the Aloha time slot in the time slot table may be different, and therefore, the message that comprises this information has variable-length, and can be segmented into and be used for several time slot table message of transmitting at broadcast channel.Each time slot table message can be specified 3 Aloha time slots of as many as, as shown in Figure 3.Minimum slotted messages is used, and these all are assigned with a sequence number and send to increase preface, and resends with same sequence finishing the transmission back in identical multi-frame.Yet sometimes, sending complete time slot table just has been enough to single time slot table message.
Broadcast channel himself comprises the predetermined portions of each time slot in each frame of multi-frame, and also is used to broadcast various message except that being used to time slot table message.In addition, give the different priority of these dissimilar distribution of messages.Therefore, in 0 to 7 frame of multi-frame, time slot table message has lowest priority, and may can not transmit owing to the capacity of other message.Yet, in frame 8,9,12 and 13, time slot table message is provided with high priority, thereby has guaranteed at least a portion of time slot table and probably be the transmission of all time slot table.
Information in the time slot table is encoded reducing bandwidth, and must be with reference to comprising that the carrier wave meter (Carrtier-List) of load frequency details defines.This carrier wave meter also transmits in the broadcast channel in the frame 15 of the last multi-frame of transmission time slot table.
The base station sends the exclusive information of each subscriber unit, and the RF carrier frequency in the subscriber unit is as follows:
(ⅰ) preferential (so-called ' in vain ' channel)
(ⅱ) when not having available rf frequency, use (so-called ' ash ' channel)
(ⅲ) do not use (so-called ' deceiving ' channel)
Each subscriber unit is stored this information.Specifically, each subscriber unit keeps the carrier wave meter corresponding to the classification of the information that receives from the base station, indicates preferential radio frequency (" in vain "), only just is not used the frequency (" ash ") of (this is because they provide relatively poor quality) and the frequency (" deceiving ") that is not used when having available preferential time slot.
If for example, the use of the subscriber unit of RF frequency in a section (sector) might be disturbed the transmission of the subscriber unit in the adjacent sections, then this RF frequency is classified as " deceiving ".Though when the RF frequency provided poor quality but still can propagate acceptably, the RF frequency was classified as " ash ".
Upgrade the carrier wave meter of classification according to access success
The base station is whether success of supervising connections for calling on a period of time, and these callings can be that public switch telephone network (PSTN) is called out and/or with the call try (test calls) to each RF frequency of each subscriber unit of radio communication.In case of necessity, the RF frequency is reclassified.For example, transmitting above not being used for successful call on the time of predetermined percentage if be classified as the RF frequency of " in vain ", then this frequency can be re-classified as " ash " automatically.Monitored conversely speaking, enough reliable " ash " frequency is re-classified as " in vain ".
Enough insecure or cause that the RF frequency of interference is reclassified " deceiving ".The carrier wave meter of the classification of the renewal of each subscriber unit is updated periodically.
The wait receiving mode of subscriber unit
When subscriber unit was not used to call out, it kept a state, and under this state, subscriber unit " is listened to " beep-page message of importing by broadcast channel with preferential RF carrier frequency.As mentioned above, broadcast channel comprises a plurality of sections of each time slot in the frame, common down link (base station is to the subscriber unit) common signaling channel that forms of these sections.Paging receiving message shows should be provided with calling.
" (camp) anchors a tent " preferential RF carrier frequency of promptly " listening to " beep-page message normally is classified as the RF carrier frequency of " in vain " thereon, yet, if this RF carrier frequency lost efficacy, then carry out the search that other is classified as the RF carrier frequency of " in vain " automatically, be suitable for " anchoring a tent " to determine in these other RF carrier frequencies, whether to have.If have, then select one.Can not use if be classified as the RF carrier frequency of " in vain ", then be classified as the search of the RF carrier frequency of " ash ".If this search does not obtain the result yet, all possible RF carrier frequency of all base stations in the scan for networks then can be used for the RF carrier frequency of the certain base station that communicates with subscriber unit with searching.
Determined whether to anchor a tent in a specific RF carrier frequency by subscriber unit, this subscriber unit is counted the Cyclic Redundancy Check number of errors in the message that sends in descending common signaling channel (broadcast channel).If have the mistake more than number of threshold values in the given time, then this RF carrier frequency is considered to incongruent, and reattempts another RF carrier frequency.
In another embodiment, detect mistake in forward error correction (FEC) sign indicating number in the message that sends by broadcast channel, be fit to determine which RF carrier frequency.
Claims (24)
- In the predetermined time slot in the fixed length time frame from the method for first unit of transmission and reception to the second unit of transmission and reception transmitting control message, described control messages is used to control described Unit second, described Unit second when wait for receiving with the message of the selected RF carrier frequency input of " listening to (listen) ", the RF carrier frequency of described selection is selected from the RF frequency class of available and override use, and whether described RF frequency successfully classifies according to the communication on the carrier frequency of selecting in advance.
- 2. the method for transmitting control message as claimed in claim 1, wherein said control messages comprises availability (availability) data of the RF carrier frequency that is used for described Unit second of communicating with described first module, whether described usability data successfully upgrades according to the communication on the RF of each selection carrier frequency, described usability data transmits constantly, to upgrade described Unit second.
- 3. the method for transmitting control message as claimed in claim 1 or 2, each that wherein is assigned in the carrier radio frequency of first module all is classified into preferential use, inferior preferential use and the poorest preferential use.
- 4. as the method for any the described transmitting control message in the claim 1 to 3,, then will select time preferential RF carrier frequency if wherein can not select to be classified as the RF carrier frequency of preferential use.
- 5. the method for transmitting control message as claimed in claim 4, if wherein not being classified as preferential or inferior preferential RF carrier frequency can select, then described second unit scan is assigned to all RF carrier frequencies of the network of Unit first and second, " listens to " by the RF carrier frequency of described first module transmission and with described frequency to determine to can be used for.
- 6. the method for the described transmitting control message of arbitrary as described above claim, wherein said Unit second is a subscriber unit, and described first module is the base station.
- 7. the method for the described transmitting control message of arbitrary as described above claim, wherein said transmission is undertaken by radio.
- 8. the method for the described transmitting control message of arbitrary as described above claim, call setup request or short message " are listened to " in wherein said Unit second.
- 9. wherein there are a plurality of Unit second of communicating with described first module of being used in the method for the described transmitting control message of arbitrary as described above claim, and for each Unit second described RF carrier frequency is classified separately.
- In the predetermined time slot in the fixed length time frame in the method for second unit of transmission and reception from the first unit of transmission and reception receiving control message, described control messages is used to control described Unit second, the message of input " is listened to " in described Unit second with selected RF carrier frequency when waiting for reception, the RF carrier frequency of described selection is selected from the RF frequency class of available and override use, and whether described RF frequency successfully classifies according to the communication on the carrier frequency of selecting in advance.
- 11. the method for receiving control message as claimed in claim 10, wherein said control messages comprises the usability data of the RF carrier frequency that is used for described Unit second of communicating with described first module, whether described usability data successfully upgrades according to the communication on the RF of each selection carrier frequency, described usability data receives constantly, to upgrade described Unit second.
- 12. as the method for claim 10 or 11 described receiving control messages, the carrier radio frequency that wherein is assigned to first module is classified into preferential use, inferior preferential use and the poorest preferential use.
- 13.,, then will select time preferential RF carrier frequency if wherein can not select to be classified as the RF carrier frequency of preferential use as the method for any the described receiving control message in the claim 10 to 12.
- 14. the method for receiving control message as claimed in claim 13, if wherein not being classified as preferential or inferior preferential RF carrier frequency can select, then described second unit scan is assigned to all RF carrier frequencies of the network of Unit first and second, " listens to " by the RF carrier frequency of described first module transmission and with described frequency to determine to can be used for.
- 15. receiver that is used in the predetermined time slot of fixed length time frame from the transmitter receiving control message, described control messages is used to control described receiver, described receiver " is listened to " message of input with selected RF carrier frequency when waiting for reception, the RF carrier frequency of described selection is selected from the RF frequency class of available and override use, and whether described RF frequency successfully classifies according to the communication on the carrier frequency of selecting in advance.
- 16. receiver as claimed in claim 15, wherein said carrier radio frequency are classified into preferential use, inferior preferential use and the poorest preferential use.
- 17.,, then will select time preferential RF carrier frequency if wherein can not select to be classified as the RF carrier frequency of preferential use as the described receiver of claim 15 to 16.
- 18. receiver as claimed in claim 17, if wherein not being classified as time preferential RF carrier frequency can select, then described receiver scanning is assigned to all RF carrier frequencies of the network that comprises transmitter and other receiver, to be identified for the RF carrier frequency of " listening to ".
- 19. communicator, comprise first unit of transmission and reception and a plurality of second unit of transmission and reception, in the predetermined time slot of described first module in the fixed length time frame to each second unit transmitting control message, described control messages is used to control Unit second of described reception, the message of input " is listened to " in each Unit second with selected RF carrier frequency when waiting for reception, the RF carrier frequency of described selection is selected from the RF frequency class of available and override use, and whether described RF frequency successfully classifies according to the communication on the carrier frequency of selecting in advance.
- 20. communicator as claimed in claim 19, wherein said control messages to Unit second comprises the usability data of the RF carrier frequency that is used for described Unit second of communicating with described first module, whether described usability data successfully upgrades according to the communication on the RF of each selection carrier frequency, described usability data transmits constantly, to upgrade described Unit second.
- 21. as claim 19 or 20 described communicators, the carrier radio frequency that wherein is assigned to Unit second is classified into preferential use, inferior preferential use and the poorest preferential use.
- 22.,, then will select time preferential RF carrier frequency if wherein can not select to be classified as the RF carrier frequency of preferential use as any the described communicator in the claim 19 to 21.
- 23. communicator as claimed in claim 22, if wherein can not selecting to be classified as time preferential RF carrier frequency transmits with a unit in described Unit second, then described second unit scan is assigned to all RF carrier frequencies of Unit first and second, " listens to " by the RF carrier frequency of described first module transmission and with described frequency to determine to can be used for.
- 24., wherein described RF frequency is classified separately for each Unit second as any the described communicator in the claim 19 to 23.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96199295 CN1205814A (en) | 1995-11-10 | 1996-11-08 | Digital telephone using control messages transmitted in time slots for RF frequency allocation |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9523041.3 | 1995-11-10 | ||
| GB9602965.7 | 1996-02-13 | ||
| GB9620507.5 | 1996-10-02 | ||
| CN 96199295 CN1205814A (en) | 1995-11-10 | 1996-11-08 | Digital telephone using control messages transmitted in time slots for RF frequency allocation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1205814A true CN1205814A (en) | 1999-01-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96199295 Pending CN1205814A (en) | 1995-11-10 | 1996-11-08 | Digital telephone using control messages transmitted in time slots for RF frequency allocation |
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| CN (1) | CN1205814A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108563884A (en) * | 2018-04-20 | 2018-09-21 | 南京航空航天大学 | A kind of most value method of estimation towards extensive RFID system |
-
1996
- 1996-11-08 CN CN 96199295 patent/CN1205814A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108563884A (en) * | 2018-04-20 | 2018-09-21 | 南京航空航天大学 | A kind of most value method of estimation towards extensive RFID system |
| CN108563884B (en) * | 2018-04-20 | 2021-08-13 | 南京航空航天大学 | Maximum value estimation method for large-scale RFID system |
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