CN1205811A - Method and appts. for power control in a telephone system - Google Patents
Method and appts. for power control in a telephone system Download PDFInfo
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- CN1205811A CN1205811A CN96199326A CN96199326A CN1205811A CN 1205811 A CN1205811 A CN 1205811A CN 96199326 A CN96199326 A CN 96199326A CN 96199326 A CN96199326 A CN 96199326A CN 1205811 A CN1205811 A CN 1205811A
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- power level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
In apparatus and a method of transmitting messages in predetermined time slots within fixed length time frames in which the power level of a message received at a receiver is detected. If the power level falls outside one of a series of ranges around a predetermined target power level, then the power level of the next message to be transmitted is adjusted so that the power level of the next message falls within the range. Steps of detection and possible-adjustment are repeated with increasingly fine target ranges of power levels being applied.
Description
The present invention relates in Control Network from the through-put power of first transmission and receiving element to the second transmission and receiving element, is to be in the network of fixed position in the unit particularly.
Automated power control is well-known and is widely used in the GSM mobile network, particularly described in 05.05 of GSM and 05.08 standard.In the GSM network, automated power control is used to control the through-put power from each travelling carriage to the base station, and also selectively is used to control the power from base station transmits.In GSM, it is minimum that automated power control is used to make the power level of transmission.The designator of the initial transmission power that is used by travelling carriage sends from the base station as message, travelling carriage then like this message carry out.
The invention provides a kind of between first transmission and receiving element and second transmission and receiving element, the method of message transfer in the predetermined time slot in the regular length time frame, wherein the power level of the message of coming from least one unit is repeatedly detected, and in the time of beyond near one of a succession of scope it drops on the predeterminated target power level, the power level of next message waiting for transmission is conditioned, so that the power level of next message drops in the described scope, detection and possible regulating step repeat, and scope at least once is less than the scope of last time using, and each scope all is less than or equal to the scope of last time using.
Continuous measuring process can have the measuring period that prolongs further, so that determine power level with more and more higher precision.This helps making target level faster more accurately to obtain.
First module is the base station preferably, and Unit second one of a plurality of subscriber units preferably.Preferably detected and regulate from the power of the signal of subscriber unit transmission.Subscriber unit preferably is in a fixed position.And preferably adopt radio to transmit.
The invention still further relates to first transmission and the receiving element and second transmission and the receiving element that are used for message transfer in the predetermined time slot of fixed length time frame, at least one unit comprises power level detection and control device, wherein the power level to the message that receives repeats to detect, and in the time of beyond near one of a succession of scope level drops on the predeterminated target power level, the power level of next message waiting for transmission is conditioned, so that the power level of next message drops in the described scope, detection and possible regulating step are repeated, and scope at least once is less than the scope of last time using, and each scope all is less than or equal to the scope of last time using.
The present invention also relates to comprise the communicator of base station and a plurality of subscriber units, communicate by letter with each subscriber unit by sending with receiving message in the predetermined time slot in the fixed length time frame in this base station, wherein the power level from the message of subscriber unit is repeatedly detected by the base station, the base station transmits control signal according to detected power level, to regulate the power level of the message of transmitting subsequently by described subscriber unit selectively, each detects and regulating step comprises whether definite power drops near the predetermined range of target power value, and regulate according to it, in some detection step in succession at least, required power bracket is less than the scope in front the detection step.
Comprise a plurality of sub-districts in preferred network, each sub-district all has base station and subscriber unit, and the through-put power of subscriber unit is conditioned till the power that is receiving on the base station satisfies target power.This is called " closed loop " control.In this preferred network, from subscriber unit through-put power Be Controlled, thereby the power that receives on the base station drops near the target power the preset range.
Preferred network is reused the RF carrier frequency in the sub-district, to reach maximum adopting limiting bandwidth to divide timing still to make to go up constructible calls at any time.Like this, the cochannel interference level must carefully be controlled, so that other unit that uses same Frequency Distribution is produced minimum interference.The present invention in its preferred embodiment, particularly by guarantee power level be in good reception required be essentially minimum level, thereby advantageously reduced the interference volume that causes because of the subscriber unit transmission.
Now, will be illustrated the preferred embodiments of the present invention with exemplary forms and with reference to accompanying drawing, in the accompanying drawing:
The schematic view illustrating of Fig. 1 comprises the system of base station (BTE-base station terminal equipment) and subscriber unit (NTE-network-termination device);
The schematic view illustrating of Fig. 2 the frame structure and the sequential of duplex link;
Fig. 3 be expression each all have the topological diagram of a part of preferred network of 4 sub-districts of base station and subscriber unit;
Fig. 4 illustrates the power level tolerance limit figure of corresponding time;
The diagrammatic representation of Fig. 5 an example of power level detection and adjusting.
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 the 8 bit fillers of 24 bits, is the broadcast channel of 12 bits afterwards.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 necessary other information of operation that connect (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 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 ALOHA (A Leha) 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 adjacent (neighbouring) time slot 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 192 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 adjacent time-slots 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.
Stipulate that in this optimum decision system subscriber unit differentiates that (authentication) adopts query-response agreement (challenge response protocol).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.Automated power control
Whole RF frequencies/time slot is set, and promptly on the MAC level, automated power is controlled in the following manner.The calling that is based upon the MAC layer connects when beginning, and subscriber unit begins transmission control MS signal with predetermined power.The signal that the base station receives is measured, and will adjust to order and send to subscriber unit.Subscriber unit changes its through-put power to respond these orders according to the suggestion that the base station increases power.The power that receives during base station measurement is called out, and send suitable order to subscriber unit.When the MAC initialization, at first by with short initial measuring period and the target tolerance limit of loosening, this process is accelerated.
All the major advantage of handling is to reduce the interference in the network.Disturb
Two kinds of interference are arranged: cochannel disturbs and adjacent-channel interference, as described later.Typical cellular topology figure shown in Fig. 3.The benchmark sub-district is the sub-district that comprises base station BTE 1.Usable frequency is divided into several subclass, and label is fs1, fs2, fs3.
Cochannel disturbs
Operate with identical frequency set the sub-district that comprises base station BTE 1 and base station BTE 4.Transmission from subscriber unit NTE 1 to base station BTE 1 causes that the cochannel to base station BTE 4 disturbs.The accurate level that disturbs depends on two path losses between the sub-district.But, make through-put power minimize the level minimum that can make the uplink channel interference that appears on the base station BTE 4 from subscriber unit NTE 1.
Adjacent-channel interference
The sub-district that comprises base station BTE 1, BTE 2 and BTE 3 has frequency set independent of each other, its respectively label be fs1, fs2 and fs3.Each frequency set includes several selected frequencies, and label is fn, and wherein n increases with the increase of frequency.Yet, the best of usable frequency collection is used and is related to base station BTE 1, BTE 2 with the side frequency that appears in this frequency set and BTE 3 (promptly, be used on the base station BTE 1 if label is the selected rf frequency of n, then label is that the selected rf frequency of n ± 1 will be used by base station BTE 2 or BTE 3).If the power by subscriber unit NTE 1 transmission in adjacent channel (adopting above-mentioned labelling method is n ± 1) does not have the path loss between enough decay and subscriber unit NTE 1 and base station BTE 2 or the base station BTE 3 lower, then may occur disturbing.By guaranteeing that subscriber unit NTE 1 to be no more than transmitting near minimum power of successfully receiving, can further alleviate this effect.Adjusting is to optimize power level
When the connection of MAC level began, the base station was gone up in the short period (0.25 second) and is measured the signal strength signal intensity from the particular subscriber unit transmission that receives.Its precision of the measurement that provides depends on propagation conditions, but do not wish usually greater than maximum magnitude (threshold value (j), as shown in Figure 4).If received signal intensity drop on this scope (+/-j) outside, then the base station commands subscriber unit changes its through-put power.The base station may require to increase, reduce or do not change.Use subsequently and measure average received signal strength longer measuring period more accurately.If received signal intensity be in (+/-k) outside the scope, then the base station is ordered the power of change from the subscriber unit transmission once more.Be used in the whole follow-up measuring process the 3rd measuring period, and can the most accurately measure mean receiving power.If through-put power shift out (+/-n) scope, then the base station commands subscriber unit changes its through-put power.
The typical treatment process that comprises three scopes above each is narrated in Fig. 5.This has represented such a case, promptly, the measurement of the signal strength signal intensity that receives in base station on 0.25 second be in (+/-j) outside the scope, therefore first order that changes power is sent out, in order to adjusting the through-put power of subscriber unit, the signal strength signal intensity that makes the base station receive should drop on (+/-k) scope rather than (+/-n) scope.If the average signal strength that receives be in (+/-n) outside the scope, the then order of after the 3rd measuring period, sending further change power.
The advantage of the method is, the through-put power of subscriber unit almost MAC link set up at the beginning of just Regulated. It has the advantage that exceeds conventional method, wherein only during a suitable accumulated time After, just announce to measure effectively, refer to during this time that cochannel and/or adjacent channel interference amount are excessive.
Claims (18)
1. the method for a message transfer in the predetermined time slot in the fixed length time frame between first transmission and receiving element and second transmission and the receiving element, wherein the power level of the message of coming from least one unit is repeatedly detected, and in the time of beyond near one of a succession of scope it drops on the predeterminated target power level, the power level of next message waiting for transmission is conditioned, so that the power level of next message drops in the described scope, detection and possible regulating step repeat, and each scope all is less than or equal to the scope of last time using, and scope at least once is less than the scope of last time using.
2. according to the method for the described message transfer of claim 1, wherein the continuous detection step has the sense cycle that prolongs further, so that determine power level with more and more higher precision.
3. according to the method for claim 1 or 2 described message transfers, wherein first module is the base station.
4. according to the method for any one the described message transfer in the claim 1 to 3, wherein Unit second is a subscriber unit.
5. according to the method for the described message transfer of claim 4, wherein Unit second be a plurality of subscriber units one of them.
6. according to the method for claim 4 or 5 described message transfers, wherein detected and be conditioned from the signal power of this subscriber unit or the transmission of each subscriber unit.
7. according to the method for any one the described message transfer in the claim 4 to 6, wherein subscriber unit is in the fixed position.
8. according to the method for any one the described message transfer in the aforementioned claim, wherein transmission is undertaken by radio.
9. equipment that comprises first transmission and receiving element and second transmission and receiving element, be used for message transfer in the predetermined time slot of fixed length time frame, at least one unit comprises power level detection and control device, wherein the power level to the message that receives repeats to detect, and in the time of beyond near one of a succession of scope level drops on the predeterminated target power level, the power level of next message waiting for transmission is conditioned, so that the power level of next message drops in the described scope, detection and possible regulating step repeat, and scope at least once is less than the scope of last time using, and each scope all is less than or equal to the scope of last time using.
10. according to the described equipment of claim 9, wherein power level detection and control device comprise the more and more device of long sense cycle of application, so that determine power level with higher precision.
11. according to claim 9 or 10 described equipment, wherein first module is the base station, and Unit second be a plurality of subscriber units one of them.
12. according to the described equipment of claim 11, wherein subscriber unit is in the fixed position.
13. according to any one the described equipment in the claim 9 to 12, wherein transmission is carried out with radio.
14. communicator that comprises base station and a plurality of subscriber units, communicate by letter with each subscriber unit by sending with receiving message in the predetermined time slot in the fixed length time frame in this base station, wherein the power level from the message of subscriber unit is repeatedly detected by the base station, the base station transmits control signal according to detected power level, to regulate subsequently power level selectively by the message of described subscriber unit transmission, each detects and regulating step comprises whether definite power drops near the preset range of the value of target power value, and regulate in view of the above, power bracket required in some continuous detection step at least is less than the scope in the detection step last time.
15. according to the described communicator of claim 14, wherein subscriber unit is in a fixed position.
16. a communication network comprises a plurality of sub-districts, each sub-district has according to claim 14 or the described communicator of claim 15.
17. according to the described communication network of claim 16, wherein the RF carrier frequency is repeated to utilize in the sub-district, to reach maximum adopting limiting bandwidth to divide timing still to make to go up constructible calls at any time.
18. according to the described communication network of claim 17, wherein power level be adjusted to enough low, with the interference between avoiding substantially communicating by letter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96199326A CN1205811A (en) | 1995-11-10 | 1996-11-07 | Method and appts. for power control in a telephone system |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9524663.3 | 1995-12-01 | ||
| GB9523062.9 | 1995-12-01 | ||
| CN96199326A CN1205811A (en) | 1995-11-10 | 1996-11-07 | Method and appts. for power control in a telephone system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1205811A true CN1205811A (en) | 1999-01-20 |
Family
ID=5129429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96199326A Pending CN1205811A (en) | 1995-11-10 | 1996-11-07 | Method and appts. for power control in a telephone system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1205811A (en) |
-
1996
- 1996-11-07 CN CN96199326A patent/CN1205811A/en active Pending
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