WO2004086653A1 - ランダムアクセス制御方法、基地局および端末装置 - Google Patents
ランダムアクセス制御方法、基地局および端末装置 Download PDFInfo
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- WO2004086653A1 WO2004086653A1 PCT/JP2004/003906 JP2004003906W WO2004086653A1 WO 2004086653 A1 WO2004086653 A1 WO 2004086653A1 JP 2004003906 W JP2004003906 W JP 2004003906W WO 2004086653 A1 WO2004086653 A1 WO 2004086653A1
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- base station
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/204—Multiple access
- H04B7/216—Code division or spread-spectrum multiple access [CDMA, SSMA]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
- H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
- H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
- H04B2201/7097—Direct sequence modulation interference
- H04B2201/709709—Methods of preventing interference
Definitions
- the present invention relates to a random access control method using CDMA (Code Division Multiple Access), and particularly to a case in which a plurality of terminal devices communicate with a base station using the same spreading code. It relates to a random access control method.
- CDMA Code Division Multiple Access
- a random access control method in a conventional communication system For example, as a basic random access control method in which each terminal transmits a bucket at random without allocating a fixed radio channel to each terminal (mobile station), a slotted-ALOHA (Non-patented) Reference 1).
- the time axis is divided into fixed time intervals called “slots”, and packets are transmitted using this slot. Since the time axis is slotted, it is necessary to establish synchronization at each terminal.
- the slot Aloha method unlike the most basic Pure-ALOHA (Pure-ALOHA) method, does not partially overlap packets, and determines whether packets overlap completely (collision) or do not overlap at all. , Or.
- each terminal on the transmitting side spreads the transmitted data using an individually assigned spreading code. You. Then, the spread signal is transmitted in synchronization with the slot time by the slot ALOHA method.
- the base station on the receiving side despreads the signal transmitted by the communication method using an individual spreading code and extracts a desired signal. Thereby, a desired signal can be extracted even at the time of collision.
- signals can be extracted even at the time of collision, retransmission of packets is reduced, and as a result, throughput characteristics are improved.
- Fig. 1 and Fig. 2 A conventional lander that applies CDMA to the slotted Aloha method. If the system access control method is applied to a system in which it is assumed that the same spreading code is assigned to multiple terminals, it may not be possible to extract a desired signal due to packet collision. In particular, the above-mentioned conventional random access control method is applied to a satellite communication system (a system in which a plurality of terminals are assumed to use the same spreading code) in which the distance to the satellite is almost equal between terminals.
- the present invention has been made in view of the above, and it is possible to accurately extract a desired signal even when it is assumed that the same spreading code is assigned to a plurality of terminals, and further improve throughput.
- the purpose is to provide a random access control method that can achieve the above. Disclosure of the invention
- a single or a plurality of terminal devices communicate with a base station via a satellite, and further, the same spread code is assigned to each of the terminal devices.
- a random access control method wherein the base station is configured to perform a predetermined process for each of the terminal devices to individually adjust a delay time of transmission data.
- each of the terminal devices arranges the spread transmission data whose delay time has been individually adjusted based on the delay time information within a prescribed slot (slot length> transmission data length).
- the base station notifies each terminal of the delay time information describing the delay time of each chip of the spreading code via a satellite, and each terminal transmits the information based on the delay time information.
- the data is transmitted in one slot including the guard time while shifting at random in chip units. This reduces slot collisions (disappearances).
- FIG. 1 is a diagram illustrating a configuration of a communication system according to the present invention
- FIG. 2 is a diagram illustrating delay time information according to the first embodiment
- FIG. 3 is a diagram in which each terminal transmits transmission data.
- FIG. 4 is a diagram illustrating an example of a case where transmission is performed while being shifted arbitrarily in one slot.
- FIG. 4 is a diagram illustrating a configuration of a terminal and a base station.
- FIG. 5 is a diagram illustrating random access control according to the second embodiment.
- FIG. 6 is a diagram illustrating an example of a process in the method
- FIG. 6 is a diagram illustrating an example of a process in the random access control method according to the second embodiment
- FIG. 7 is a diagram illustrating the process in the random access control method according to the second embodiment.
- FIG. 8 is a diagram illustrating an example of a process
- FIG. 8 is a diagram illustrating an example of a process in the random access control method according to the second embodiment
- FIG. 9 is a diagram illustrating delay time information according to the third embodiment.
- Fig. 10 shows the layout of the fourth embodiment.
- FIG. 11 is a diagram illustrating an example of processing in a dumb access control method.
- FIG. 11 is a diagram illustrating a random access control method according to a fifth embodiment.
- FIG. 12 is an example of a slot format according to the fifth embodiment.
- FIG. 13 is a diagram showing an example of a slot format according to Embodiment 6 in each terminal.
- FIG. 14 illustrates a reservation-type random access control method according to the seventh embodiment.
- a random access control method when a quasi-zenith satellite system is used as an example of a communication system will be described.
- the quasi-zenith satellite system adopts a random access control method that applies CDA to the slot Aloha method and that the same spreading code is assigned to multiple terminals.
- This quasi-zenith satellite system is limited to areas where three satellites orbit the earth in one day through a predetermined orbit, and at least one of the three satellites always exists near Japan's sky (zenith).
- Type satellite system if the satellite is switched every eight hours, an elevation angle of 60 degrees or more is always ensured, and users can always use good mobile communication services (car telephone services, Mobile phone services, a simple positioning system separate from GPS, etc.).
- mobile communication services car telephone services, Mobile phone services, a simple positioning system separate from GPS, etc.
- satellites when viewed from major areas in Japan, satellites always exist within 20 degrees from the zenith, so for example, simply pointing the car antenna toward the zenith changes the direction of travel of the car.
- good communication is always possible, and satellite tracking is not required, so that the communication device can be simplified.
- FIG. 1 is a diagram showing a configuration of a communication system according to the present invention.
- the communication system includes terminals 1-1, 1-2,... 1N, a satellite 2, and a base station 3. .
- the base station uses The probability that the reception timings match (collide) becomes extremely high (without chip However, if a collision occurs, the packet becomes invalid. Therefore, in the communication system according to the present invention, “transmission data + guard time” is set to one slot.
- each terminal transmits transmission data while arbitrarily shifting it within one slot. As a result, a chip shift occurs.
- a base station can extract a desired received packet by using the special features of CDMA (interference between codes can be reduced due to the chip shift).
- FIG. 2 is a diagram showing delay time information according to the first embodiment in which the base station 3 notifies each mobile station (111 to 1-N). Specifically, (a) shows the slot format when the base station transmits delay time information by TDM (Time Division Multiple), and (b) shows the slot time by the base station by CDM (Code Division Multiple). Represents the slot format when transmitting the.
- TDM Time Division Multiple
- CDM Code Division Multiple
- a specific time zone or all in one slot is allocated as a time zone for delay time information
- CDM Code Division Multiple
- a specific channel In Fig. 2, Ch # l
- the downlink base station ⁇ each terminal
- Each terminal determines the transmission position of the transmission data based on the delay time information.
- FIG. 3 is a diagram illustrating an example of a case where each terminal transmits transmission data while arbitrarily shifting it within one slot (T sl . T ).
- the illustrated slot is composed of a plurality of symbols, and spreading / despreading processing is performed on a symbol basis.
- FIG. 4 is a diagram showing a configuration of each terminal (1_1 to 1-N) and the base station 3.
- Each terminal spreads transmission data Si (t) to SN (t) with the same spreading code.
- the transmitted delay time includes a signal extracting unit 13—1, 13-2,... 13—N for extracting quotient information and data.
- the base station 3 despreads the received signal and outputs the received data.
- the delay time information generation unit 33 generates the delay time information of each embodiment described later, and the signal generation unit 32 transmits the delay time information to each terminal via the satellite 2. Is multiplexed with the data and transmitted.
- the delay time information of the present embodiment describes the delay time of the spreading code in units of chips. Then, in each terminal, each signal extraction unit extracts the delay time information and data addressed to itself.
- each spreading section spreads each transmission data with the same spreading code, and each delay control section adjusts the transmission timing of the spread transmission data based on the delay time information.
- the delay control unit of each terminal randomly selects a delay time in chip units from the above-described delay time information, and transmits the spread transmission data with the delay time added thereto in a predetermined slot. And send it (see Fig. 3).
- each despreading unit despreads the received signal and extracts the original transmission data.
- the base station 3 can extract desired data by despreading for each symbol.
- the base station notifies each terminal of the delay time information describing the delay time of the spreading code in units of chips to each terminal via the satellite, and each terminal uses the delay time information based on the delay time information. Therefore, the transmission data was transmitted in a slot including the guard time while shifting it randomly in chip units. As a result, slot collisions (disappearances) can be reduced, and as a result, throughput can be improved.
- each terminal randomly selects the delay time in chip units.
- the base station may determine the delay time in chip units of the spread code and the terminal identification information (terminal Any information may be used as long as it can be identified.)
- delay time information associated with the information may be notified to each terminal. That is, the base station may determine the delay time in chip units in each terminal. This avoids (or reduces) slot collisions.
- base station 3 transmits delay time information to each mobile station via satellite 2 in the same process as in the first embodiment.
- delay time information of the present embodiment the time window location for a delay time adjustment (e.g., corresponding to FIG. 5 of the T w or Figure 6 T w., T wl, T w2), the Is associated with the identification information of multiple or single terminals that are allowed to transmit data within the time window. That is, the base station 3 S, and each terminal is grouped in time window units.
- FIG. 5 and FIG. 6 are diagrams illustrating an example of a process in the random access control method according to the second embodiment.
- the delay control unit of each terminal the host terminal belongs time window groups based on the delay time information (T w or T w., T wl, T w2) recognizes, designated The delay time in chip units is selected within the time window, and the spread transmission data to which the delay time is added is placed in the slot and transmitted.
- the base station notifies each terminal via a satellite of delay time information obtained by grouping each terminal in time window units, and each terminal uses the delay time information based on the delay time information.
- the transmission data is transmitted while being shifted in chip units within the specified time window. As a result, slot collisions (extinction) can be reduced, and as a result, throughput can be improved.
- the size of the time window is made variable (corresponding to T w0 and T wl in FIG. 7) according to the traffic volume in the time window. I'm sorry. Also, as shown in Fig. 8, the time window depends on the traffic volume within the time window. The number may be adjustable. Thereby, the search range in the base station can be adjusted.
- each terminal may transmit the transmission data while shifting the data randomly in chip units within a specified time window based on the delay time information.
- the transmission timing of each terminal can be made uniform within the time window, so that slot collision can be further reduced.
- base station 3 transmits delay time information to each mobile station via satellite 2 in the same process as in the first embodiment.
- restriction information on data transmission for example, congestion status based on traffic volume is set for each time window.
- FIG. 9 is a diagram showing delay time information according to the third embodiment in which the base station 3 notifies each mobile station (111 to 111N). More specifically, (a) shows the slot format when the base station transmits delay time information by TDM (Time Division Multiple), and (b) shows the base station when the base station uses CDDM (Code Division Multiple Multiple). ) Indicates the slot format when delay time information is transmitted.
- TDM Time Division Multiple
- CDDM Code Division Multiple Multiple Multiple
- a specific time zone or all in one slot is allocated as a time zone for delay time information
- CDM Code Division Multiple Multiple
- a specific channel is used. (Ch # 1 in Fig. 9) is assigned as a channel for delay time information.
- restriction information (congestion status based on traffic volume) for data transmission is set for each time window (delay time information # 1 to # ⁇ ).
- the downlink base station ⁇ each terminal
- the downlink must be CDM. No need.
- the delay control unit of each terminal randomly selects a time window for data transmission based on the delay time information, that is, according to the congestion state of each time window. (e.g., of FIG. 6 T, "., selected from the T ',. have T w2), further randomly selects a delay time of the chip unit in a selected time window, is the delay time
- the added spread transmission data is arranged in the slot and transmitted.
- the base station sets, as delay time information, restriction information on data transmission for each time window, notifies the terminal of the delay time information to each terminal via satellite, Then, a time window for data transmission is randomly selected based on the delay time information, and the transmission data is transmitted in a chip-by-chip and random manner within the range of the selected time window.
- slot collision disappearance
- throughput can be improved.
- restriction information in the present embodiment is not limited to the above, but may be restriction information that ensures data transmission of a user with high priority or urgency (restriction on the number of users in a specific time window, time It is also possible to set an enlarged window, specify an identification number that can select a specific time window, etc.).
- the fourth embodiment for example, in the random access control method of the first to third embodiments, when the transmission data of a specific terminal cannot be accommodated in the time window of the same code, the transmission data of the terminal is replaced with another spreading code. To spread and transmit. As a result, the collision (disappearance) of slots can be reduced, and as a result, the throughput can be improved.
- a time window may be arranged by selecting a portion where the cross-correlation between the spreading codes is small. As a result, slot collision can be further reduced.
- a random access control method for example, in a satellite communication system, a plurality of terminals may transmit data at the same time.
- the transmitted signal collides on the channel, so that the base station cannot extract the data, but such a collision is generated by the control of the base station.
- Frequency can be suppressed sufficiently (IC MA: Idle-signal Casting Multiple Access).
- IC MA Idle-signal Casting Multiple Access
- a result detected by the base station is transmitted to each terminal as vacancy / busy information via a downlink channel. Then, each terminal transmits data after confirming that the empty / block information is “empty”.
- the above-mentioned ICMA can improve the throughput by the above-described processing, and is therefore applied to, for example, a TDMA (Time Division Multiple Access) mobile communication system and the like.
- TDMA Time Division Multiple Access
- the base station cannot extract data due to collision.
- a random access control method using air / occlusion information is applied to the quasi-zenith satellite system of the CDMA shown in FIG.
- the same spreading code is assigned to a plurality of terminals
- different spreading codes may be used when there are many terminals accessing the power.
- interference between codes can be reduced.
- FIG. 11 is a diagram showing a random access control method according to the fifth embodiment.
- the system configuration of the present embodiment and the configuration of each device configuring the system are basically the same as those of FIGS. 1 and 4 described above. Description is omitted.
- only operations different from those of the second and third embodiments described above will be described.
- the delay time information generation unit 33 transmits the delay time information of the embodiments 2 and 3 described above and the empty Z block information of each window (corresponding to the IZB shown in FIG. Not required for delay time information of form 3) and received / non-received information for each terminal (
- the signal generation unit 32 multiplexes the above information and data to each terminal via the satellite 2 and transmits the multiplexed data.
- the respective signal extraction units determine the delay time information, the idle / busy information (not required in the case of the delay time information in the third embodiment), and the received / non-received information. , And data destined for itself.
- FIG. 12 shows an example of the slot format of the fifth embodiment in which the base station 3 notifies each mobile station (111 to 1-N) (when the delay time information of the second embodiment is applied).
- FIG. Specifically, (a) shows the slot format when the base station transmits delay time information by TDM, and (b) shows the slot format when the base station transmits delay time information by CDM.
- TDM a specific time zone or all in one slot is allocated as delay time information, idle / busy information in time window units, and identification information in terminal units.
- CDM a specific channel (Ch #l in Fig. 12) is assigned as a channel for delay time information, empty Z block information in time window units, and identification information in terminal units.
- the amount of traffic is described as the empty / occupied information for each time window, and each terminal determines “empty” and “occupied” using a predetermined threshold value of the reference (note that However, since the delay time information of the third embodiment includes the traffic amount for each time window, “empty” and “blocked” are determined based on the delay time information).
- the identification information for each terminal describes the identification information of the terminal that has been successfully received in the previous reception processing, and each terminal has the capability to transmit new data ⁇ retransmission data. To judge. As shown in the figure, the downlink (base station ⁇ each terminal) does not need to be CDM.
- the delay time information of the second embodiment is applied as the delay time information
- the empty / occupied information is “empty (below the threshold)”
- the reception / non-reception information of the own terminal is “reception (with identification information)” or the first data transmission
- new transmission data is controlled within a specified time window in the same procedure as in Embodiment 2 (spreading processing, delay time adjustment, etc.).
- each terminal performs the following steps on the basis of the above-mentioned delay time information in the same manner as in Embodiment 2 (spreading processing, delay time adjustment, etc.). Control within the specified time window. If the empty Z block information of the specified time window is “blocked (threshold exceeded)”, it will be in the transmission waiting state.
- each signal extraction unit checks the congestion state (traffic volume) of each time window in the delay time information, A time window for data transmission is randomly selected from the time windows determined to be “empty (below threshold)”. Then, for example, when the reception Z non-reception information of the own terminal is “reception (with identification information)” or the first data transmission, each terminal transmits new transmission data based on the delay time information. Control is performed within the selected time window by the same procedure as in Mode 3 (spreading processing, delay time adjustment, etc.).
- each terminal performs retransmission data based on the delay time information. Is controlled within the selected time window by the same procedure as in Embodiment 3 (spreading processing, delay time adjustment, etc.). In the above confirmation processing, if all the time windows are determined to be “closed (exceeding the threshold value)”, a transmission wait state is set.
- each despreading unit despreads the received signal and extracts the original transmission data.
- the base station 3 can extract desired data by despreading for each symbol.
- the base station further notifies each terminal of the traffic volume in time window units and the reception / non-reception information of each terminal via satellite, and each terminal transmits Data based on the traffic volume of A transmission time window and a data type (new Z retransmission) are determined, and transmission data (new Z retransmission) is determined within the determined time window based on the delay time information of the second or third embodiment. It is decided to transmit the data while shifting it at random on a chip basis. As a result, the collision (extinction) of the slots can be further reduced, and as a result, the throughput can be improved.
- the empty Z block information is binary, but the present invention is not limited to this.
- three or five levels may be set.
- the degree of congestion of the time window is expressed as “sky”, “crowd”, “blockage”. This makes it possible to select / specify a more appropriate time window.
- each terminal measures S / N using a known symbol transmitted from base station 3 and determines the number of identical transmission data to be continuously transmitted based on the measurement result. Then, each terminal enters control information including the number of the same transmission data to be continuously transmitted and information on a time window into a transmission slot and transmits the control information to the base station 3.
- FIG. 13 is a diagram showing an example of the slot format of Embodiment 6 in each terminal.
- control information includes, for example, the same transmission data (encoding code for error correction). (The turn may be changed.) Is shifted by one chip length or more in one time window, and the information is described. Or, describe information that the same transmission data (error correction coding pattern may be changed) is assigned to multiple time windows. Alternatively, if the transmission power is insufficient, the information indicating that the same transmission data (error correction coding pattern may be changed) is assigned to multiple slots. The transmission time interval when the same transmission data is assigned to multiple slots is variable according to the transmission path conditions.
- each terminal transmits a plurality of identical data, so that the combining process by the base station can improve the communication quality in any transmission path condition.
- a random access control method in a reservation-type random access control method, a specific terminal makes a reservation for a data slot using an access slot, and a base station sends a reservation to a terminal for which reservation by the access slot is completed. Notifies the transmission timing and spreading code required for data transmission, and permits data transmission. Then, based on the notified information, the only terminal that is permitted to transmit data transmits the spread transmission data using the data slot.
- FIG. 14 is a diagram showing a reservation-type random access control method according to the present embodiment.
- data slot reservation is performed using the random access control method according to the first to fourth embodiments.
- the transmission data in each embodiment is Replaced by information for reserving Tsu bets (reservation information), transmitted using the access slot the reservation information (TA sl. T). Then, the terminal that is permitted to data transmission, the transmission data, based on the above conventional manner so notified transmission timing and spreading code, transmitted using Detasuro' bets (T sl. T).
- each terminal transmits information (reservation information) for reserving a data slot by using any of the methods of Embodiments 1 to 4 described above. .
- slot collisions extinction
- throughput can be improved.
- each terminal may transmit a plurality of pieces of the same reservation information (see FIG. 13). Thereby, communication quality can be improved.
- the base station notifies each terminal via a satellite of delay time information describing, for example, the delay time of each chip of a spreading code, and each terminal transmits, for example, Then, a delay time in chip units is randomly selected from the delay time information, and the spread transmission data delayed by the delay time is arranged and transmitted in a prescribed slot.
- a delay time in chip units is randomly selected from the delay time information, and the spread transmission data delayed by the delay time is arranged and transmitted in a prescribed slot.
- the random access control method according to the present invention is useful for a communication system employing CDMA, and in particular, it is assumed that a plurality of terminal devices communicate with a base station using the same spreading code. Suitable if you do.
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JP2003081996A JP2004289717A (ja) | 2003-03-25 | 2003-03-25 | ランダムアクセス制御方法、基地局および端末装置 |
JP2003-081996 | 2003-03-25 |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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US9826431B2 (en) | 2012-10-18 | 2017-11-21 | Mitsubishi Electric Corporation | Weighted random selection of transmission resources based on device position |
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CN104584456B (zh) | 2012-08-21 | 2018-02-02 | 三菱电机株式会社 | 一种通信系统及通信终端 |
JP5556915B2 (ja) * | 2013-01-25 | 2014-07-23 | 三菱電機株式会社 | 通信システム |
Citations (7)
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WO1994021056A1 (en) * | 1993-03-05 | 1994-09-15 | Ntt Mobile Communications Network Inc. | Random access communication method by use of cdma, and system for mobile stations which use the method |
JPH07504552A (ja) * | 1992-03-05 | 1995-05-18 | クァルコム・インコーポレーテッド | Cdmaセル通信システムでベース局を同時にアクセスする自動車局間のメッセージの衝突を減少する装置および方法 |
JPH07297753A (ja) * | 1994-04-28 | 1995-11-10 | Oki Electric Ind Co Ltd | フレーム送信タイミング制御方法 |
JPH1098447A (ja) * | 1996-08-28 | 1998-04-14 | At & T Corp | 衛星内切換cdma通信システムにおける同期方法 |
JPH10510966A (ja) * | 1994-12-15 | 1998-10-20 | スタンフォード・テレコミュニケーションズ・インコーポレーテッド | Cdmaシステムのためのネットワーク参入チャンネル |
JP2000188784A (ja) * | 1998-10-14 | 2000-07-04 | Lucent Technol Inc | 通信システムにおけるランダム・チップ遅延アクセス優先順位のための方法および装置 |
WO2001037494A2 (en) * | 1999-11-15 | 2001-05-25 | Telefonaktiebolaget Lm Ericsson (Publ) | Access spreading in a packet data radio system |
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2003
- 2003-03-25 JP JP2003081996A patent/JP2004289717A/ja active Pending
-
2004
- 2004-03-23 KR KR1020057011841A patent/KR20050088323A/ko not_active Application Discontinuation
- 2004-03-23 WO PCT/JP2004/003906 patent/WO2004086653A1/ja not_active Application Discontinuation
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH07504552A (ja) * | 1992-03-05 | 1995-05-18 | クァルコム・インコーポレーテッド | Cdmaセル通信システムでベース局を同時にアクセスする自動車局間のメッセージの衝突を減少する装置および方法 |
WO1994021056A1 (en) * | 1993-03-05 | 1994-09-15 | Ntt Mobile Communications Network Inc. | Random access communication method by use of cdma, and system for mobile stations which use the method |
JPH07297753A (ja) * | 1994-04-28 | 1995-11-10 | Oki Electric Ind Co Ltd | フレーム送信タイミング制御方法 |
JPH10510966A (ja) * | 1994-12-15 | 1998-10-20 | スタンフォード・テレコミュニケーションズ・インコーポレーテッド | Cdmaシステムのためのネットワーク参入チャンネル |
JPH1098447A (ja) * | 1996-08-28 | 1998-04-14 | At & T Corp | 衛星内切換cdma通信システムにおける同期方法 |
JP2000188784A (ja) * | 1998-10-14 | 2000-07-04 | Lucent Technol Inc | 通信システムにおけるランダム・チップ遅延アクセス優先順位のための方法および装置 |
WO2001037494A2 (en) * | 1999-11-15 | 2001-05-25 | Telefonaktiebolaget Lm Ericsson (Publ) | Access spreading in a packet data radio system |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9826431B2 (en) | 2012-10-18 | 2017-11-21 | Mitsubishi Electric Corporation | Weighted random selection of transmission resources based on device position |
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KR20050088323A (ko) | 2005-09-05 |
JP2004289717A (ja) | 2004-10-14 |
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