AU3913099A - Control channel carrier sense in TDMA-TDD mobile communication system - Google Patents
Control channel carrier sense in TDMA-TDD mobile communication system Download PDFInfo
- Publication number
- AU3913099A AU3913099A AU39130/99A AU3913099A AU3913099A AU 3913099 A AU3913099 A AU 3913099A AU 39130/99 A AU39130/99 A AU 39130/99A AU 3913099 A AU3913099 A AU 3913099A AU 3913099 A AU3913099 A AU 3913099A
- Authority
- AU
- Australia
- Prior art keywords
- control channel
- reception
- data
- electric field
- period
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Landscapes
- Mobile Radio Communication Systems (AREA)
- Time-Division Multiplex Systems (AREA)
Description
pp, S F Ref: 470472
AUSTRALIA
PATENTS ACT 1990 COMPLETE SPECFICATION FOR A STANDARD PATENT
ORIGINAL
Name and Address of Applicant: Actual Inventor(s): Address for Service: NEC Corporation 7-1, Shiba Minato-ku Tokyo
JAPAN
Katsumi Tanoue Spruson Ferguson, Patent Attorneys Level 33 St Martins Tower, 31 Market Street Sydney, New South Wales, 2000, Australia Control Channel Carrier Sense in TDMA-TDD Mobile Communication System 0 O9 Invention Title: The following statement is a full description of this invention, including the best method of performing it known to me/us:- 5845 CONTROL CHANNEL CARRIER SENSE IN TDMA-TDD MOBILE COMMUNICATION
SYSTEM
Background of the Invention 1. Field of the Invention The present invention relates to a control carrier sense in a TDMA-TDD (Time Division Multiple Access-Time Division Duplex) system mobile communication system.
1 0 2. Description of the Related Art In a TDMA mobile communication system, transmission is attained using a control channel to inform a base station data, a radio frame and so on from a base station. For example, a PHS S. 15 system uses a TDMA-TDD communication system.
Communication between a base station and a mobile S* station is performed in a time division in units of time slots. One frame consists of 8 time slots.
4 time slots in the first half of one frame are allocated for the transmission from the base station. The period of the 4 time slots is referred to as a transmission period. The other 4 time slots in the second half thereof are allocated for the transmission from the mobile station to the base station. The period of the 4 time slots is referred to as a reception period.
Because of the convenience of the r 2 explanation, it is supposed that numbers of i, 2, 3, 4 are allocated in order from the head of the time slots in the transmission period. Also, numbers of i, 2, 3, 4 are allocated in order from the head of the time slots in the reception period. When the base station and one mobile station communicate with each other, a transmission from the base station to the mobile station is performed using a time slot in the 1 0 transmission period as a transmission time slot.
A transmission from the mobile station to the base station is performed using the time slot in the reception period having the same time slot number as the transmission time slot.
15 A signal is transmitted on a downstream control channel from the base station to the .e :mobile station using the time slot of the transmission period. The transmission is performed once per a plurality of frames. Because the downstream control channel is an important channel in the communication control, the control channel signal is necessary to be transmitted using a time slot having the smallest interference from adjacent base stations.
Conventionally, the transmission of the control channel signal is performed at the timing specified by data previously stored in each of 3 base stations or at the timing specified by a data specified from a central control station.
However, in a micro-cell type TDMA-TDD mobile communication system represented by PHS (Personal Handiphone System), it is difficult to specify the timing like the conventional case, because the number of base stations in the whole system becomes enormous and the number of base stations 4 3 ±equIItly changed. Therefore, in such a TDMA- 10 TDD mobile communication system, each base station performs the search of the timing at which a control channel is established in the e e transmission start of the control channel signal.
This search operation is called a control channel 5** 15 carrier sense.
In a conventional method of performing the control channel carrier sense, the base station measures a reception electric field intensity at the transmission frequency in the control channel over the predetermined time period, when the transmission of the control channel signal from the base station is started. Thus, the base station establishes the control channel at the timing where there is little interference.
For example, when a plurality of radio base stations are neighbor, there is the possibility for the radio base stations to interfere with
I
4 each other because the control channels established by the radio base stations are asynchronous. Therefore, in "radio telephone apparatus" which is disclosed in Japanese Laid Open Patent Application (JP-A-Heisei 7-264659), when the base station is turned on so as to be supplied with power, the electric field intensity of the control carrier wave is measured for a predetermined time to produce a data table in 1 0 advance to indicate existence or non-existence of the control carrier wave. Then, the data table is referred to to determine a timing at which the other radio base stations do not use for transmission and a control carrier signal for its 15 station is transmitted.
However, in the conventional method as mentioned above, the base station measures a reception electric field intensity only for a transmission period, little interference is guaranteed for the control channel from the base station to a mobile station. However, little interference is not guaranteed for the control channel from the mobile station to the base station for a reception period. Also, little interference is not guaranteed for the control channel (an upstream control channel) which is established at the time when a call is issued 5 from the mobile station. For this reason, there is fear that a signal of the control channel established at the time when the call is issued from the mobile station cannot be received.
As described above, a downstream control channel signal from the base station is repeatedly transmitted at a ratio of once per a plurality of frames using the time slot having the same time slot number in the transmission period. When this repetition period is expressed by T(LCCH), the transmission of an upstream control channel signal by the mobile station is a *random access. Also, the upstream control channel signal is transmitted using the time slot having S. 15 the same time slot number as in a downstream control frame for the reception period in an
S*
optional frame in T(LCCH). Therefore, the measurement of the electric field intensity by the base station must be performed for not only the transmission period but also the reception period. Also, it is necessary to determine a time slot of a time slot number having little interference in the reception period.
In conjunction with the above, a transmission power control method is disclosed in Japanese Laid Open Patent application
(JP-A-
Heisei 8-280064). In this reference, the electric 6 field intensity of each of a downstream control channel and an upstream control channel and bit error rates are measured before the establishment of a communication channel. An initial transmission power of each of the downstream control channel and the upstream control channel is determined based on the measuring result.
Summary of the Invention 10 Therefore, an object of the present ainvention is to provide a control channel carrier o* a sensing method in a TDMA-TDD mobile communication system, and an apparatus for the same, in which a e• time slot having little interference is a 15 determined for not only a downstream control channel but also an upstream control channel.
In order to achieve an aspect of the present invention, a control channel carrier sensing apparatus in a time divisional multiple access time division duplex (TDMA-TDD) mobile communication system, includes a receiving section, a determining section and a control section. The receiving section receives a reception signal based on a measurement time period specifying data to generate a reception electric field intensity data for each time slot within a transmission period and a reception 7 period of each frame. The determining section determines a control channel time slot based on the reception electric field intensity data for each reception period and the reception electric field intensity data for each transmission period using threshold level data. A control channel signal is transmitted or received using the control channel time slot. The control section sets the measurement time period specifying data S 10 to the receiving section and the threshold level data to the determining section to control the receiving section and the determining section.
Here, it is preferable that the control section dynamically controls the receiving 15 section and the determining section. Also, the control section specifies a time period between the transmission time slots by the measurement time period specifying data. One frame is composed of the transmission period and the reception period, each of which is composed of a plurality of time slots. A control channel period is composed of a plurality of frames.
The receiving section generates an average of the reception electric field intensity data for the corresponding time slots over corresponding frames in units of control channel periods as the reception electric field intensity 8 data when a period specified based on the measurement time period specifying data is longer than the control channel period.
The determining section may include a selecting section and a transmission time slot determining section. The selecting section selects one of a plurality of groups of time slots based on the reception electric field intensity data for each time slot for each 10 reception period and the threshold level data.
Each group includes the time slots at corresponding positions in the reception periods @6*g over the frames. The transmission time slot determining section determines one of the 15 reception electric field intensity data for each of the time slots of the group selected by the selecting section and the threshold level data to determine the control channel time slot.
In this case, the selecting section preferable to check the reception electric field intensity data for the reception periods in units of groups based on a reception threshold level of the threshold level data, and to select one of the plurality of groups such that the selected group has the most of the reception electric field intensity data lower than the reception threshold level. Also, the transmission time slot 9 determining section is preferable to compare the reception electric field intensity data for the transmission periods corresponding to the selected group with a transmission threshold level of the threshold level data, and to determine one of the plurality of time slots as the control channel time slot such that the determined time slot has a minimum reception electric field intensity data lower than the 9 0 transmission threshold level.
When the selecting section can not select e, 9 one of the plurality of groups, the control 0*99 section may change the measurement time period specifying data and the threshold level data to .9 15 control the receiving section and the determining *see section to repeat the above control. Also, when 9999 the transmission time slot determining section can not determine the control channel time slot, the control section changes the measurement time period specifying data and the threshold level data to control the receiving section and the determining section.
In order to achieve another aspect of the present invention, a method of performing a control channel carrier sensing process in a time divisional multiple access time division duplex (TDMA-TDD) mobile communication system, includes: 10 receiving a reception signal based on a measurement time period specifying data to generate a reception electric field intensity data for each time slot within a transmission period and a reception period of each frame; determining a control channel time slot based on the reception electric field intensity data for each reception period and the reception electric field intensity data for each 10 transmission period using threshold level data,; setting the measurement time period specifying data and the threshold level data; and
OSS*
transmitting or receiving a control channel signal using the control channel time slot.
•00 Brief Description of the Drawings 6SSS Fig. 1 is a block diagram illustrating the structure of a control channel carrier sensing apparatus according to an embodiment of the present invention; Fig. 2 is a diagram illustrating a radio format of a PHS system; Fig. 3 is a flow chart illustrating the operation of a time slot number selecting section of Fig. 1; Fig. 4 is a flow chart illustrating the operation of a transmission time slot determining 11 section of Fig. 1; and Fig. 5 is a flow chart illustrating the operation of the whole apparatus shown in Fig. 1.
Description of the Preferred Embodiments Hereinafter, a control channel carrier sensing apparatus in a TDMA-TDD (Time Division Multiple Access-Time Division Duplex) system mobile communication system of the present 0 invention will be described with reference to the drawings.
Fig. 1 is a block diagram illustrating the oo e control channel carrier sensing apparatus in a TDMA-TDD system mobile communication system
S.
15 according to an embodiment of the present S•o invention. Referring to Fig. i, the control channel carrier sensing apparatus is composed of a reception electric field intensity measuring section 2, a slot number selecting section 4, a transmission slot determining section 7 and a central control section 9.
A reception signal input 1 is supplied from a radio section to the reception electric field intensity measuring means 2. The reception electric field intensity measuring means 2 measures the reception electric field intensity of the reception signal input 1 for each time
I
12 slot in a measurement condition which has been previously specified from the central control section 9. Then, the reception electric field intensity measuring section 2 outputs the reception electric field intensity data for all the time slots, together with the time slot numbers of the time slots.
A symbol of a signal on an output line or from the reception electric field intensity 10 measuring section 2 of Fig. 1 shows the measured °*g value of this reception electric field intensity.
A subscript under the symbol shows the time slot number of the time slot.
Fig. 2 is a diagram illustrating a .15 downstream control channel transmission period in PHS system. Referring ti Fig. 2, in the PHS system, one frame is composed of 8 time slots. 4 time slots of the first half are used for a transmission from a base station to a mobile station, and are called a transmission period.
Also, the other 4 time slots of the second half thereof are used for the transmission from the mobile station to the base station, and are called a reception period.
A control channel signal is intermittently sent out from the base station to the mobile station, and is transmitted using the time slot 13 having the same time slot number at the rate of once to a plurality of frames. It is supposed that the downstream control channel transmission period is expressed by T(LCCH).
The time slot numbers of 1, 2, 3, 4 are allocated to the 4 time slots of the transmission period. Also, time slot numbers of 1, 2, 3, 4 are allocated to the 4 time slots of the reception period. In the communication between one mobile
S
10 station and a base station, a time slot having 0000 the same time slot number in the same frame is 0 used. The time slot numbers of 1, 2, 3, 4, 5, 6, 500* 5*e 7, 8 may be allocated to 8 time slots in one frame from the head of the transmission period.
In this case, sets of time slot numbers is (1 and 5500 (2 and (3 and 7) and (4 and 8) for the communication with one mobile station.
As shown in Fig. 1, all the reception electric field intensity measured values 3 for the reception period are supplied to the time slot number selecting section 4. Also, all the reception electric field intensity measured values 6 for the transmission period are supplied to the transmission time slot determining section 7. Also, the time slot number 5 is selected by the time slot number selecting section 4 and is supplied to the transmission time slot 14 determining section 7. The transmission time slot determining section 7 determines a transmission time slot 8 based on the time slot number 5 and all the reception electric field intensity measured values 6 for the transmission period.
Generally, the reception electric field intensity measuring section 2 performs the measurement over a time period longer than the or 4 5 control channel transmission period of T(LCCH).
10 In this case, the reception electric field o intensity measuring section 2 may average the reception electric field intensity measuring values for corresponding time slots to output as the reception electric field intensity measuring 15 value 3. Instead, the reception electric field goo.
intensity measuring section 2 puts the same Ofl.
subscript to the reception electric field intensity measuring values corresponding to the same time slot number. Then, the process equivalent to the averaging process may be performed by the time slot number selecting section 4 and the transmission time slot determining section 7.
For the convenience of the explanation, a number is allocated to each of time slots in one period of T(LCCH). It is supposed to be n frames in the period of T(LCCH). In order to distinguish 15 of whether the time slot is in the transmission period or in the reception period, an alphabet (the time slot in the transmission period) or (the time slot in the reception period) is allocated, ash shown in Fig. 1. Also, numbers of 1 to n are allocated as frame numbers. Further, number of 1 to 4 are allocated as the time slot numbers in the transmission period or the reception period. For example, the time slot with 10 a number T52 is a second time slot in the transmission period of the fifth frame. When the transmission is performed from the base station to the mobile station using the time slot, the corresponding mobile station transmits using the 15 time slot with the time slot number R52.
The base station measures an electric field intensity for each of time slots in one period of T(LCCH) previously in case of the transmission start of the downstream control channel signal, and determines that a control channel signal should be transmitted using which of the time slots, based on the measuring result.
Fig. 3 is a flow chart illustrating the operation of the time slot number selecting section 4 of Fig. 1.
In a step 31, the time slots having the electric field intensity measured value lower 1 16 than a threshold level are counted. In an example shown in Fig. 2, the reception electric field intensity measured values are supplied from the reception electric field intensity measuring section 2 for every time slot number. For example, it is supposed that the number of reception electric field intensity measured values which are lower than the threshold level is with respect to the electric field intensity measured 9 c *6ee 9 0 9.
S. 9 90..
9* 9* 9 9 10 values SR11, SR21, with the time slot that the number of intensity measured the threshold level reception electric values SR12, SR22, with the time slot that the number of intensity measured the threshold level reception electric values SR13, SR23, with the time slot SRnl of the time slots number 1. Also, it is supposed reception electric field values which are lower than is "15" with respect to the field intensity measured SRn2 of the time slots number 2. Also, it is supposed reception electric field values which are lower than is with respect to the field intensity measured SRn3 of the time slots number 3. Further, it is supposed that the number of reception electric field intensity measured values which are lower than the threshold level is with respect to the electric field intensity measured values SR14, 17 SR24, SRn4 of the time slots with the time slot number 4. In this case, if a threshold count is an answer of YES is determined in a step 32. In a step 33, because the count value has a maximum value of "15" in the time slot number 2, a value is outputted to the transmission time slot determining section 7 as the time slot number
S
Fig. 4 is a flow chart illustrating the 10 operation of the transmission time slot determining section 7 of Fig. 1.
In a step 41, the time slot having the
O
minimum reception electric field measured value .S S lower than the threshold level is selected from 15 the reception electric field intensity measured values 6 with respect to only the electric field 0 intensity measured values of the time slots with the time slot number selected by the time slot number selecting section 4. That is, if the reception electric field intensity measured values 6 are ST11, ST12, ST13, ST14, ST21, ST22, STn4 as shown in Fig. 1 and the time slot number 5 which has been selected by the time slot number selecting section 4 is a time slot number of only the electric field intensity measured values of ST12, ST22, ST32, ST42, STn2 are an object of the above selection. The 18 other ones are ignored among the reception electric field intensity measured values 6. Then, the time slots having the electric field intensity measured values lower than the threshold level are searched.
It is supposed that the reception electric field intensity measured values lower than the threshold are ST32 and ST42. In this case, these two electric field intensity measured values are S. 10 compared in a step 43 via the step 42. If the electric field intensity measured value ST32 is minimum, the time slot T32 is determined as the time slot for transmission of the control channel signal. The time slot T32 is the time slot with the time slot number 2 in the transmission period with the frame number 3.
Also, if the judgment in the step 32 of Fig.
3 is NO or the judgment in the step 42 of Fig. 4 is NO, a data of "no candidate" is informed to the central control section 9. The central control section 9 sets a new search condition to the reception electric field measuring section 2, the time slot number selecting section 4 and the transmission time slot determining section 7 in response to the data. Thus, the control channel carrier sensing process is re-executed under the new search condition.
19 A total operation is shown as a flow chart of Fig. 5. That is, in a step 51, a measurement time is set to the reception electric field intensity measuring section 2. Also, the reception threshold level for the reception period and the threshold count are set to the time slot number selecting section 4. The reception level threshold for the transmission period is set to the transmission time slot determining section 7. In the judgment of step 52, if there is a time slot which meets the set condition, the transmission of the control channel signal is started using the determined transmission time slot (Step 53). If there is not oooo oo 15 a time slot which meets the set condition in the judgment of step 52, the control returns to the step 51. Then, the steps 52 and 53 are repeated after the set condition is changed.
As described above, according to the present invention, it is confirmed at the time of the downstream control carrier sense in the base station that there is not interference at the timing of the upstream control channel signal.
Therefore, there is no case where the upstream control channel signal is interfered when the mobile station transmits a control channel signal, so that the probability increases in which the 20 upstream control channel signal arrives at the base station. Therefore, the call connection percentage can be improved, because the upstream control channel connection percentage increases when the position registration request and a call request are received from the mobile station and the arrival request is received from the network.
"Also, the method of determining the control channel transmission timing can be changed by the S. 10 central control section. Therefore, a parameter can be flexibly changed in accordance with the operation situation of the system. Thus, the control channel transmission timing can be more surely and dynamically determined.
eeoc
Claims (16)
1. A control channel carrier sensing apparatus in a time divisional multiple access time division duplex (TDMA-TDD) mobile communication system, comprising: a receiving section receiving a reception signal based on a measurement time period specifying data to generate a reception electric field intensity data for each time slot within a transmission period and a reception period of each frame; a determining section determining a control channel time slot based on said reception electric field intensity data for each reception period and said reception electric field intensity data for each transmission period using threshold level data, a control channel signal being transmitted or received using said control channel time slot; and a control section setting said measurement time period specifying data to said receiving section and said threshold level data to said determining section to control said receiving section and said determining section.
2. A control channel carrier sensing apparatus in a TDMA-TDD mobile communication system 22 according to claim i, wherein said control section dynamically controls said receiving section and said determining section.
3. A control channel carrier sensing apparatus in a TDMA-TDD mobile communication system according to claim 1 or 2, wherein said control section specifies a time period between said transmission slots by said measurement time period specifying data. o.
4. A control channel carrier sensing apparatus U. U• in a TDMA-TDD mobile communication system according to any of claims 1 to 3, wherein one oooo frame is composed of said transmission period and 5 said reception period, each of which is composed of a plurality of time slots, and a control channel period is composed of a plurality of frames. A control channel carrier sensing apparatus in a TDMA-TDD mobile communication system according to claim 4, wherein said receiving section generates an average of said reception electric field intensity data for the corresponding time slots over corresponding frames in units of control channel periods as 23 said reception electric field intensity data when a period specified based on said measurement time period specifying data is longer than said control channel period.
6. A control channel carrier sensing apparatus in a TDMA-TDD mobile communication system according to any of claims 1 to 5, wherein said determining section includes: 5 a selecting section selecting one of a plurality of groups of time slots based on said o°S.reception electric field intensity data for each 5*S5 SS° time slot for each reception period and said threshold level data, each group including said &see time slots at corresponding positions in said reception periods over said frames; and a transmission slot determining section determining one of the reception electric field intensity data for each of the time slots of said group selected by said selecting section and said threshold level data to determine said control channel time slot.
7. A control channel carrier sensing apparatus in a TDMA-TDD mobile communication system according to claim 6, wherein said selecting section checks the reception electric field 24 intensity data for said reception periods in units of groups based on a reception threshold level of said threshold level data, and selecting one of said plurality of groups such that said selected group has the most of the reception electric field intensity data lower than said reception threshold level. go0 a
8. A control channel carrier sensing apparatus S-in a TDMA-TDD mobile communication system o according to claim 6 or 7, wherein said *pap transmission slot determining section compares °p p the reception electric field intensity data for said transmission periods corresponding to said selected group with a transmission threshold p""level of said threshold level data, and determines one of said plurality of time slots as said control channel time slot such that said determined time slot has a minimum reception electric field intensity data lower than said transmission threshold level.
9. A control channel carrier sensing apparatus in a TDMA-TDD mobile communication system according to any of claims 6 to 8, wherein said control section changes said measurement time period specifying data and said threshold level 25 data to control said receiving section and said determining section, when said selecting section can not select one of said plurality of groups. A control channel carrier sensing apparatus in a TDMA-TDD mobile communication system according to any of claims 6 to 9, wherein said o o control section changes said measurement time a 5 period specifying data and said threshold level °eo@ data to control said receiving section and said determining section, when said transmission slot determining section can not determine said *e a. o• a control channel time slot. a .o 11. A method of performing a control channel carrier sensing process in a time divisional multiple access time division duplex (TDMA-TDD) mobile communication system, comprising: receiving a reception signal based on a measurement time period specifying data to generate a reception electric field intensity data for each time slot within a transmission period and a reception period of each frame; determining a control channel time slot based on said reception electric field intensity data for each reception period and said reception electric field intensity data for each 26 transmission period using threshold level data; setting said measurement time period specifying data and said threshold level data; and transmitting or receiving a control channel signal using said control channel time slot.
12. A method according to claim 11, wherein said setting includes dynamically setting said "measurement time period specifying data and said threshold level data. @0o 0** o
13. A method according to claim 11 or 12, wherein a time period between said transmission 0 slots by said measurement time period specifying data is specified.
14. A method according to any of claims 11 to 13, wherein one frame is composed of said transmission period and said reception period, each of which is composed of a plurality of time slots, and a control channel period is composed of a plurality of frames. A method according to claim 14, wherein said receiving includes generating an average of said reception electric field intensity data for 27 the corresponding time slots over corresponding frames in units of control channel periods as said reception electric field intensity data when a period specified based on said measurement time period specifying data is longer than said control channel period.
16. A method according to any of claims 11ii to wherein said determining includes: ~selecting one of a plurality of groups of time slots based on said reception electric field O ee 5 intensity data for each time slot for each reception period and said threshold level data, o each group including said time slots at 000* corresponding positions in said reception periods 00 over said frames; and determining one of the reception electric field intensity data for each of the time slots of said group selected by said selecting section and said threshold level data.
17. A method according to claim 16, wherein said selecting includes: checking the reception electric field intensity data for said reception periods in units of groups based on a reception threshold level of said threshold level data; and 28 selecting one of said plurality of groups such that said selected group has the most of the reception electric field intensity data lower than said reception threshold level.
18. A method according to claim 16 or 17, wherein said determining includes: a comparing the reception electric field intensity data for said transmission periods 0**g 5 corresponding to said selected group with a transmission threshold level of said threshold 4406 :4 level data; and determining one of said plurality of time p. 4oo slots as said control channel time slot such that said determined time slot has a minimum reception ':electric field intensity data lower than said transmission threshold level.
19. A method according to any of claims 16 to 18, wherein said setting includes changing said measurement time period specifying data and said threshold level data when said selecting section can not select one of said plurality of groups. A method according to any of claims 16 to 19, wherein said setting includes changing said measurement time period specifying data and said I
29- threshold level data when said transmission slot determining section can not determine said control channel time slot. 21. A control channel carrier sensing apparatus in a time divisional multiple access time division duplex (TDMA-TDD) mobile communication system, said apparatus being substantially as herein described with reference to the drawings. 22. A method of performing a control channel carrier sensing process in a time divisional multiple access time division duplex (TDMA-TDD) mobile 10 communication system, said method being substantially as herein described with reference to the drawings. DATED this First Day of July 1999 NEC Corporation Patent Attorneys for the Applicant 15 SPRUSON FERGUSON [N:\IibL]00253:JJP
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10-210313 | 1998-07-10 | ||
| JP10210313A JP2947278B1 (en) | 1998-07-10 | 1998-07-10 | Control channel carrier sense method for TDMA-TDD mobile communication system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU3913099A true AU3913099A (en) | 2000-02-03 |
Family
ID=16587358
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU39130/99A Abandoned AU3913099A (en) | 1998-07-10 | 1999-07-09 | Control channel carrier sense in TDMA-TDD mobile communication system |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2947278B1 (en) |
| CN (1) | CN1149869C (en) |
| AU (1) | AU3913099A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005026086B3 (en) * | 2005-06-07 | 2006-09-14 | Atmel Germany Gmbh | Transmission channels` allocation determining method for data transmission-/receiving device, involves evaluating correlation results of demodulated signals and partial sequences to produce output signal indicating allocation of channels |
| JP4635947B2 (en) * | 2005-10-12 | 2011-02-23 | パナソニック株式会社 | Power line communication device, integrated circuit, and power line communication method |
| CN100438672C (en) * | 2005-12-31 | 2008-11-26 | 华为技术有限公司 | Multi time-slot public measuring method and system |
| DE102016122610B4 (en) | 2016-11-23 | 2019-04-18 | Tdk Electronics Ag | Device that provides haptic feedback and device with the device |
-
1998
- 1998-07-10 JP JP10210313A patent/JP2947278B1/en not_active Expired - Lifetime
-
1999
- 1999-07-08 CN CNB991095464A patent/CN1149869C/en not_active Expired - Fee Related
- 1999-07-09 AU AU39130/99A patent/AU3913099A/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| CN1243406A (en) | 2000-02-02 |
| CN1149869C (en) | 2004-05-12 |
| JP2947278B1 (en) | 1999-09-13 |
| JP2000032539A (en) | 2000-01-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5850605A (en) | Method and apparatus for dynamically grouping transmitters for message transmission in a communication system | |
| KR100209771B1 (en) | Base station selecting method for cdma cell system | |
| US6480483B2 (en) | Frame synchronization system between base stations of mobile radio communication system and base station device employing this system | |
| JP3349477B2 (en) | Mobile communication device, mobile communication system, and communication channel assignment request method | |
| EP2259498A2 (en) | Dual mode subscriber unit for short range, high rate and long range, lower rate data communications | |
| KR950000360B1 (en) | Radio communications system | |
| US6650907B1 (en) | Method for producing a semiconductor storage device | |
| EP0961512B1 (en) | A method for performing handover in a radio communication environment. | |
| US20090168763A1 (en) | Apparatus and method for managing channel capacity and dect base station for the same | |
| AU3913099A (en) | Control channel carrier sense in TDMA-TDD mobile communication system | |
| US6522896B2 (en) | Antenna diversity base station for transmission of unidirectional channels and corresponding method of transmission of a unidirectional channel by a base station | |
| CN100479604C (en) | Radio base station system and channel assignment method | |
| JP3128008B2 (en) | Termination control method for mobile communication system and mobile station thereof | |
| EP0726690A2 (en) | Procedure to increase the traffic capacity in a wireless communications system | |
| JP2981126B2 (en) | Mobile station of cordless telephone system | |
| EP0467600A1 (en) | Radio link architecture for wireless communication systems | |
| JPH09200118A (en) | Mobile communication system | |
| CN1960214B (en) | Method for realizing synchronization in PHS system | |
| KR970007611B1 (en) | Radio system | |
| JPH07123317B2 (en) | Connection control method in mobile communication | |
| JP2965132B2 (en) | Mobile radio | |
| JPH10271553A (en) | Radio telephone system | |
| JP3400266B2 (en) | Digital cordless telephone equipment | |
| JPH10107726A (en) | Transmission output changeover radio repeater communication system | |
| JPH1065600A (en) | Mobile communication equipment and radio line switch control method therefor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MK5 | Application lapsed section 142(2)(e) - patent request and compl. specification not accepted |