CN101083822B - Improvement for wireless communication system - Google Patents
Improvement for wireless communication system Download PDFInfo
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- CN101083822B CN101083822B CN2006101059099A CN200610105909A CN101083822B CN 101083822 B CN101083822 B CN 101083822B CN 2006101059099 A CN2006101059099 A CN 2006101059099A CN 200610105909 A CN200610105909 A CN 200610105909A CN 101083822 B CN101083822 B CN 101083822B
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- travelling carriage
- time slots
- timeslot number
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Abstract
A method is disclosed for operating a wireless TDMA communications system. The method includes steps of monitoring a propagation delay of a mobile station; and when the propagation delay exceeds a predetermined limit, changing by a time slot unit a value of one or both of Tta1 and/or Ttb1, wherein Tta1 is a minimum number of time slots allowed between the end of a previous receive time slot and a next transmit time slot, when a channel measurement is to be performed inbetween, and wherein Ttb1 is a minimum number of time slots allowed between the end of a previous receive timeslot and a next transmit time slot.
Description
Technical field
The present invention relates generally to radio telephone and radio telephone system, relate in particular to time division multiple access (TDMA) cellular radio or travelling carriage and radio communications system and network.
Background technology
In the TDMA of at least a type radio communications system, oppositely tdma frame is in up link, promptly from travelling carriage (MS) to the base station appearance of (BS) than forward direction tdma frame at down link, promptly from the base station to the travelling carriage time of occurrence postponed to reach fixed cycle of 3 time slots.Can obtain the situation that Fig. 1 describes after having increased propagation delay by timing advance parameter (TA) compensation.The increase that is appreciated that TA makes T
Rt(receiving the time that begins to send from end) diminishes.Yet, T
RtReduce will cause occurring one or more problems.For example, when travelling carriage during away from its serving base transceiver station or BTS, TA will become greater than certain desired maximum of wireless network.For instance, in global system for mobile communications (GSM) network, the corresponding approximately radius of society of 35km of this maximum, so T
RtCan become less than the minimum value of expectation.Because T
RtMinimum value be used for determining the multislot capability of travelling carriage and network, so this is very important.In fact, ETSI publish " GSM 05.02: digital cellular communication system (Phase 2+); Multiplexed and multiple access on radio path " multislot capability that travelling carriage (MS) is supported described in the document.The particular time-slot of distributing to MS will depend on the type of MS, the service that provides and whether require neighbor cell power to measure.Network must be determined above-mentioned matters before restricted solving the institute that TS is distributed.
There are two parameters to rely on T
Rt, be that " GSM 05.02: digital cellular communication system (Phase 2+) at the title of publishing by ETSI (ETSI); Multiplexed and multiple access on radio path " this has been made in the document regulation.These two parameters are as follows:
T
Ta: for 1 type travelling carriage (promptly not requiring the travelling carriage that sends simultaneously and receive), when this parameter has stipulated that channel measurement will be carried out by travelling carriage therebetween, the minimum timeslot number that allows between last transmission or receiving slot end and next sending time slots.
T
Tb: for 1 type travelling carriage, this parameter regulation is when therebetween frequency shift, and last receiving slot finishes and next time between the sending time slots, or the minimum timeslot number that allows between last sending time slots and back one sending time slots.
These two parameters are specified in a plurality of time slots.Therefore, if TA is enough big, then effective value (from the viewpoint of travelling carriage) can reduce a time slot.Yet, therefore can't reduce two time slots because TA is restricted.In other words, these sub-districts are big inadequately.
For instance, as the mobile largest cell radius (35km) that exceeds the GSM regulation of 1 type travelling carriage, its T
RtBe reduced to a value, in this value, travelling carriage receives certain part uplink burst that can't send its distribution behind its downlink burst.This situation can be described as overlapping, and Fig. 2 shows the such example with following distribution.Suppose the situation for Fig. 2, network is a high speed circuit switched data (HSCSD) and asymmetric, and downlink time slots 2 and 3 is used, and time slot 2 is used for up link.When travelling carriage was enough far away apart from its serving BTS, the increase of TA caused up link and downlink burst overlapping.Therefore, 1 type travelling carriage will be lost a burst.
On the other hand, the increase of TA will make T
TrIncrease.Therefore, relevant parameter (T
Ra, T
Rb) should be no problem.In this respect can be with reference to " the GSM05.02: digital cellular communication system (Phase 2+) of document above-mentioned: ETSI publication; Multiplexed and multiple access on radio path ".From the viewpoint of travelling carriage, the effective value of this parameter can't become less than the minimum value of expectation.
We know in the prior art, can be by forbidding the big problem of continuous slot Business Processing radius of society.Yet to affected travelling carriage, this technology will make network capacity reduce half, and can't support the multi-slot operation, as be the operation of HSCSD or general packet radio (GPRS) regulation.
Summary of the invention
Therefore, first purpose of the present invention provides the method that a kind of radius of society that can increase tdma system avoids being grown by propagation delay the problem that causes simultaneously.
Another object of the present invention provides a kind of at least one timing parameters of dynamic correction to regulate the method for the travelling carriage in the long radius sub-district in the TDMA network.
The radius of society that the invention discloses a kind of effective increase TDMA based system is so that revise the method for this parameter by the scope that increases timing advance (TA) parameter.This timing advance can be greater than a time slot with less than two time slots.By reducing to require to prevent that from finishing to receive the time limit that begins to send up link and down link are overlapping.Compare T with conventional gsm system
RtValue allows to reduce to be equal to the TA parameter and allows to increase, and T
RtThe additional decrease of the maximum of value is a time slot.The propagation delay that has than the sub-district of long radius at base station monitoring increases, and also can consider the TA value when the base station maps channel.
In one exemplary embodiment, consider GSM 450 situations, the radius of sub-district can be greater than conventional GSM radius (35km).For adapting to the increase of radius of society, revise the timing advance parameter so that increase its effective range.Yet because the scope of timing advance parameter becomes big, the operation of TDMA travelling carriage may be subjected to negative effect, to such an extent as to the burst in up link (reverse link) and the down link (forward link) is with time-interleaving.Therefore one aspect of the present invention is to provide a kind of multislot capability of dynamic change travelling carriage, thereby reduces or overcome the technology of this problem.
The invention discloses a kind of method of controlling the wireless TDMA communication system, the method comprising the steps of: the propagation delay that monitors travelling carriage; When propagation delay surpasses pre-specified time, change T
Ta1And/or T
Tb1Value time slot unit, wherein a T
Ta1When carrying out channel measurement betwixt, the minimum timeslot number that last receiving slot finishes and allows between the sending time slots next time.And T wherein
Tb1The minimum timeslot number that finishes and allow between the sending time slots next time for last receiving slot.
According to a further aspect of the invention, provide a kind of method of controlling the wireless TDMA communication system, comprise step:
Monitor the propagation delay of travelling carriage; And
When propagation delay exceeds pre-specified time, change scheduled volume of minimum timeslot number that travelling carriage finishes and allows between the sending time slots next time at last once receiving slot.
According to a further aspect of the present invention, also provide a kind of wireless communication system, comprising: a base station; And at least one travelling carriage; Wherein the base station comprises the propagation delay monitoring arrangement, its output is compared with a predetermined value at processing unit, and respond this and relatively send one and instruct travelling carriage, to change scheduled volume of minimum timeslot number that travelling carriage finishes and allows between the sending time slots at last once receiving slot next time.
According to a further aspect of the invention, a kind of method of controlling the wireless TDMA communication system is provided, this system comprises a travelling carriage that can work in a plurality of time slots in the frame, this method comprises: the propagation delay that monitors travelling carriage, when exceeding pre-specified time, increase the timeslot number that the last receiving slot of travelling carriage finishes and allows between the sending time slots next time with convenient propagation delay.
The consequence that increases the timeslot number that finishes last receiving slot and begin to allow between one sending time slots of back is, can be used for distributing to reduce corresponding with the receiving slot number of transmission of travelling carriage in this frame.Therefore, be enough to satisfy the level that current multislot services (for example high-speed link swap data (HSCSD) or general packet radio service (GPRS)) requires although wish to remain on the time slot allocation of travelling carriage one, but can be used for this professional timeslot number in possible this frame will be less than desired value, in the case, network must be rethought the distribution of system resource.
According to a further aspect of the invention, a kind of method of controlling the wireless TDMA communication system is provided, and this system comprises a travelling carriage that can work in a plurality of time slots in the frame, and this method comprises: the propagation delay that monitors travelling carriage, and when propagation delay exceeds pre-specified time, change T
TaAnd/or T
TbValue time slot unit, wherein a T
TaWhen measuring for carrying out betwixt, the minimum timeslot number that last receiving slot finishes and allows between the sending time slots next time.And T wherein
Tb1Be the minimum timeslot number that finishes and allow between the sending time slots next time at last once receiving slot.
Description of drawings
Simultaneously with reference to the accompanying drawings can clearer above-mentioned and further feature of the present invention by detailed description of the present invention subsequently, wherein:
Fig. 1 has illustrated conventional down link and up link tdma slot figure also to have described timing advance (TA) and relevant parameter;
Fig. 2 has illustrated the influence of known overlap problem;
Fig. 3 is according to the block diagram of telling about the travelling carriage embodiment that is applicable to tdma system of the present invention;
Fig. 4 is the elevation view of travelling carriage shown in Figure 3, has also illustrated by the RF link moving platform wireless communication system of two-way connection with it;
Fig. 5 has illustrated the dynamic multi-slot type algorithm of the instruction according to the present invention.
Specific implementation
At first with reference to figure 3 and Fig. 4, they have illustrated one to be suitable for realizing wireless user terminal of the present invention or travelling carriage 10, for example but be not limited to cellular radio or personal communicator.Travelling carriage 10 comprises antenna 12, be used for and base or base station 30 between send and received signal, suppose that base station 30 comprises base station sub-system (BSS) 30A and base transceiver station (BTS) 30B.For simplicity, these two assemblies are referred to as base station 30.BSS 30A can connect a plurality of BTS 30B.Base station 30 is a part that comprises the wireless network 32 of (MSC) 34 of mobile switching centre or similar device.MSC34 provides and being connected of land line main line.
Travelling carriage comprises modulator (MOD) 14A, transmitter 14, receiver 16, demodulator (DEMOD) 16A, and provides signal to transmitter 14 and receiver 16 and from the controller 18 of their received signals.These signals comprise the signaling information according to the air-interface standard of this applicable cellular system, also comprise the data that voiceband user and/or user generate.The present invention supposes that air-interface standard is based on the TDMA technology, as learn or be similar to the technology of GSM from GSM.Yet the present invention is not intended to only be limited as GSM type tdma system.Generally for GSM travelling carriage and network, " gsm mobile communication system " that can write with reference to Michel Mouly and Marie-Bernadette Pautet1992, its disclosure is at this all as a reference.
It should be understood that controller 18 also comprises audio frequency and the required circuit of logic function of realizing travelling carriage.For example controller 18 can be by digital signal processor device, and micro processor device and various analog to digital converter, digital to analog converter and other support circuit are formed.The control of travelling carriage and signal processing function between these equipment according to they capability distribution separately.
User interface can comprise conventional earphone or loud speaker 17, conventional microphone 19, display 20 and user input device, typically is keyboard 22, and all these equipment connect controller 18.Keyboard 22 comprises conventional numeral (0～9) and relative keys (#, *) 22a and other key 22b that is used to handle travelling carriage 10.Travelling carriage 10 also comprises battery 26, is used to handle the required various circuit supplies of travelling carriage.Travelling carriage 10 also comprises various memories, is referred to as memory 24, has wherein stored controller 18 employed a plurality of constants and variable during handling travelling carriage.30 some TDMA that sends to travelling carriage 10 relevant parameter regularly from the base station, also to be that the present invention is special be concerned about for this, typically is stored in memory 24 and uses for controller 18.It should be understood that travelling carriage 10 can be vehicle-mounted or handheld device.It will also be appreciated that travelling carriage 10 can work in one or more interface standards, modulation type and access style, therefore can be two (or many) pattern devices.
Tell about according to of the present invention, provide a kind of basis and travelling carriage 10 relevant TA value to small parts to adjust T
TaAnd T
TbThe technology of content.Adjustment to these two parameters causes, and base station 30, especially BSS 30A change the mapping to the tdma frame of relevant travelling carriage 10.
It should be noted that the dynamic mapping mechanism that rank is changed exists really, and at publication: " GSM 04.08: digital cellular communication system (Phase 2+); The 3rd layer of standard of mobile wireless electrical interface " in be called " rank reprogramming ".Yet in the case, this change is not initiated by travelling carriage 10, but by base station 30, is especially initiated by BSS 30A partial data processor, and it monitors that value of TA is so that detect the problem that may occur.
Tell about according to of the present invention, when the TA value begins to exceed one,, in BSS 30A, change definition of T in limited time
TaAnd T
TbFollowing part:
For T
Ta, when will between when carrying out channel measurement, BSS 30A only considers its part meaning, that is, last receiving slot finish and back one sending time slots between the minimum timeslot number that allows.
For T
Tb, BSS 30A only considers its part meaning, that is, and and the minimum timeslot number that last receiving slot finishes and allows between the sending time slots next time.
The element T of consideration can be understood
TaAnd T
TbBe to be subjected to foregoing problems (T when being the TA increase
RtReduce) element of direct influence.In general, the variation of TA parameter does not influence and handles travelling carriage 10 element T of transmission continuously
TaAnd T
Tb
In a word, T
Ta1For will carry out channel measurement betwixt the time, last receiving slot finishes and the minimum timeslot number that afterwards allows between the sending time slots.T
Ta2For will carry out channel measurement betwixt the time, last sending time slots finishes and the minimum timeslot number that afterwards allows between the sending time slots.T
Tb1Be the minimum timeslot number that last receiving slot finishes and allows between the sending time slots next time, T
Tb2The minimum timeslot number that finishes and allow between the sending time slots next time for last sending time slots.
Preferably calculate TA by BSS 30A continuous monitoring propagation delay.Can be with reference to title in this respect: " GSM 05.10: digital cellular telecommunications system (Phase 2+); Radio subsystem is synchronous " publication.The present invention has also increased a kind of algorithm that monitors propagation delay thus.
Fig. 5 has described of the dynamic multi-slot class algorithm carried out by BSS 30A according to the present invention and has realized example.When monitoring travelling carriage 10 (steps A), the propagation delay of finding travelling carriage 10 exceeds a pre-specified time (120 μ s for example
The TA of 240 μ s
The radius of society of 35km), T
Ta1And T
Tb1Increase a time slot unit with the increase (step B) of compensation at the current location TA of travelling carriage 10, BSS 30A makes the T at least that will send to travelling carriage 10 afterwards
Ta1And T
Tb1Correction value be stored in travelling carriage memory 24.Otherwise T
Ta1And T
Tb1Still equal T respectively
TaAnd T
Tb(step C).Therefore, BSS 30A also can investigate the mapping (step D) of channel again so that satisfy new demand, and the dynamic-configuration of system resource is provided thus.For HSCSD and GPRS, new demand will cause rethinking resource distribution, for example empty slot that may be overlapping, and/or because the empty slot that can't receive or send through revising more strict timing standard.
Within this predetermined time slot, be consistent in the meaning of aforementioned parameters and the conventional GSM network (step C).Therefore, only at travelling carriage 10 during, promptly when its TA exceeds a certain pre-specified time, just preferably activate T apart from its positive serving BTS 30B threshold distance
TaAnd T
TbDifference explain.In general, T
TaAnd T
TbChange as the triggering that starts a kind of new configuration.
Although the present invention describes, it should be understood that those skilled in the art can carry out various improvement to this in the context of preferred embodiment.In addition, and as mentioned above, the present invention can be applicable to the TDMA network and the system of other type outside GSM network and the system.
Therefore, though be to describe especially and illustrate of the present inventionly, those skilled in the art will appreciate that can not depart from scope and spirit of the present invention improves its form and details at preferred embodiment.
Claims (16)
1. method that is used for operate wireless tdma communication system comprises:
Monitor the propagation delay of travelling carriage, to detect the appearance that propagation delay exceeds pre-this situation of specified time; And
Exceed pre-specified time in response to detecting propagation delay, select parameter T
Ta1And/or T
Tb1Dynamically to increase timeslot number, be used for by increasing a time slot unit with the timing advance that compensation increases, change receiving slot in the end finished and back one sending time slots between the minimum timeslot number T that allowed betwixt when carrying out channel measurement
Ta1, and be used to change the minimum timeslot number T that is allowed betwixt when frequency changes between receiving slot end in the end and back one sending time slots
Tb1
2. according to the method for claim 1, further comprise in response to changing step the correspondingly step of update the system resource distribution.
3. according to the method for claim 1, comprise to described travelling carriage provide receiving slot in the end finished and back one sending time slots between the value of the minimum timeslot number that allowed betwixt when carrying out channel measurement, and this last receiving slot finish and back one sending time slots between the value of the minimum timeslot number that allowed betwixt when changing of frequency.
4. equipment that is used for operate wireless tdma communication system comprises:
Be used to monitor the propagation delay of travelling carriage, exceed the device of the appearance of pre-this situation of specified time to detect propagation delay; And
Be used for exceeding pre-specified time, select parameter T in response to detecting propagation delay
Ta1And/or T
Tb1Dynamically to increase the device of timeslot number, be used for by increasing a time slot unit with the timing advance that compensation increases, change receiving slot in the end finished and back one sending time slots between the minimum timeslot number (T that allowed betwixt when carrying out channel measurement
Ta1), and be used to change the minimum timeslot number (T that is allowed betwixt when frequency changes between receiving slot end in the end and back one sending time slots
Tb1).
5. according to the equipment of claim 4, further be configured to exceed pre-specified time in response to propagation delay, and according to the variation update the system resource distribution of described minimum timeslot number one of them or boths' value.
6. according to the equipment of claim 4, wherein said travelling carriage has multislot capability, and receives during a plurality of time slots in a tdma frame.
7. according to the equipment of claim 4, wherein said travelling carriage has the high speed circuit switched data ability, and receives during a plurality of time slots in a tdma frame.
8. according to the equipment of claim 4, wherein said travelling carriage has the general packet radio ability, and receives during a plurality of time slots in a tdma frame.
9. according to the equipment of claim 4, this device is configured to provide one of described minimum timeslot number or both variations to described.
10. method that is used to operate the TDMA travelling carriage comprises:
Processing will by travelling carriage in the end receiving slot finish and back one sending time slots between the reception value of the minimum timeslot number that allowed betwixt when carrying out channel measurement, and in the end receiving slot finish and back one sending time slots between the reception value of the minimum timeslot number that allowed betwixt when changing of frequency, wherein, described reception value is received after propagation delay exceeds this situation appearance of pre-specified time, and
According to described processing, by increasing a time slot unit, change the minimum timeslot number that is allowed betwixt when carrying out channel measurement between receiving slot end in the end and back one sending time slots with the timing advance that compensation increases, and
Change the minimum timeslot number that is allowed betwixt when frequency changes between receiving slot end in the end and back one sending time slots.
11., comprise the step of operation TDMA travelling carriage according to the method for claim 10.
12. an equipment that is used to operate the TDMA travelling carriage comprises:
Be used to handle will by travelling carriage in the end receiving slot finish and back one sending time slots between the minimum timeslot number that allowed betwixt when carrying out channel measurement the reception value and in the end receiving slot finish and back one sending time slots between the device of reception value of the minimum timeslot number that allowed betwixt when changing of frequency, wherein, described reception value is received after propagation delay exceeds this situation appearance of pre-specified time, and
Be used for according to described processing by increasing the timing advance that a time slot unit increases with compensation, change the minimum timeslot number that is allowed betwixt when carrying out channel measurement between receiving slot end in the end and back one sending time slots, and the device that changes the minimum timeslot number that is allowed betwixt when frequency changes between receiving slot end in the end and back one sending time slots.
13. according to the equipment of claim 12, wherein said travelling carriage has multislot capability, and described travelling carriage is configured to receive during a plurality of time slots in a tdma frame.
14. according to the equipment of claim 12, wherein said travelling carriage has the high speed circuit switched data ability, and described travelling carriage is configured to receive during a plurality of time slots in a tdma frame.
15. according to the equipment of claim 12, wherein said travelling carriage has the general packet radio ability, and described travelling carriage is configured to receive during a plurality of time slots in a tdma frame.
16. according to each described equipment of claim 12 to 15, wherein said travelling carriage is a kind of multi-mode travelling carriage.
Applications Claiming Priority (9)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US13710699P | 1999-06-01 | 1999-06-01 | |
| US60/137,106 | 1999-06-01 | ||
| US60/137106 | 1999-06-01 | ||
| US13725299P | 1999-06-02 | 1999-06-02 | |
| US60/137,252 | 1999-06-02 | ||
| US60/137252 | 1999-06-02 | ||
| US09/476,404 | 2000-01-20 | ||
| US09/476404 | 2000-01-20 | ||
| US09/476,404 US6665289B1 (en) | 1999-06-01 | 2000-01-20 | Wireless telecommunications system employing dynamic multislot class |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN00808273.1A Division CN1274178C (en) | 1999-06-01 | 2000-06-01 | Improvement in wireless communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101083822A CN101083822A (en) | 2007-12-05 |
| CN101083822B true CN101083822B (en) | 2011-06-22 |
Family
ID=35864426
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006101059099A Expired - Fee Related CN101083822B (en) | 1999-06-01 | 2000-06-01 | Improvement for wireless communication system |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN101083822B (en) |
| ES (1) | ES2369527T3 (en) |
| RU (1) | RU2263414C2 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1140963A (en) * | 1995-04-13 | 1997-01-22 | 株式会社日立制作所 | Mobile wireless communication system |
| CN1161766A (en) * | 1994-09-16 | 1997-10-08 | 艾奥尼卡国际有限公司 | Transmission timing control in digital radio telephone |
| EP0836288A2 (en) * | 1996-10-01 | 1998-04-15 | Matsushita Electric Industrial Co., Ltd. | Spread-spectrum method and system for communication between a base station and a plurality of mobile units |
-
2000
- 2000-06-01 RU RU2001135850/09A patent/RU2263414C2/en not_active IP Right Cessation
- 2000-06-01 ES ES00935436T patent/ES2369527T3/en not_active Expired - Lifetime
- 2000-06-01 CN CN2006101059099A patent/CN101083822B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1161766A (en) * | 1994-09-16 | 1997-10-08 | 艾奥尼卡国际有限公司 | Transmission timing control in digital radio telephone |
| CN1140963A (en) * | 1995-04-13 | 1997-01-22 | 株式会社日立制作所 | Mobile wireless communication system |
| EP0836288A2 (en) * | 1996-10-01 | 1998-04-15 | Matsushita Electric Industrial Co., Ltd. | Spread-spectrum method and system for communication between a base station and a plurality of mobile units |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101083822A (en) | 2007-12-05 |
| ES2369527T3 (en) | 2011-12-01 |
| RU2263414C2 (en) | 2005-10-27 |
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