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公开(公告)号：JP2001358695A
公开(公告)日：2001-12-26
申请号：JP2001119083
申请日：2001-04-18
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LAROIA RAJIV , LI JUNYI , UPPALA SATHYADEV VENKATA
IPC: H04J11/00 , H04B1/7143 , H04B1/7156 , H04B1/76 , H04B7/26 , H04L5/02 , H04L27/26 , H04B1/713
Abstract: PROBLEM TO BE SOLVED: To solve the connectional problems by regarding the pilot tones of a generated pilot tone hopping sequence as multiple pilot tones and without transmitting any of them, each time the frequency range of the generated pilot tone hopping sequence exceeds the usable bandwidth of a specific system. SOLUTION: Base station discrimination and downlink synchronization are actualized, by using a pilot including known symbols transmitted with specific frequency tone at individual specific time intervals. More specifically, the symbols used for the pilot are arranged characteristically in time-frequency grids having positions specified by a periodical pilot tone hopping sequence. In a specific embodiment, cycles of the pilot tone hopping sequence start with a Latin-square based hopping sequence, and are discharged for a certain time and constituted by sequentially changing the offset and order possibly over frequencies. A specific example of the pilot tone hopping sequence is a parallel slope hopping sequence selected, so that the periodicity of the sequence is a prime number of symbol time intervals.
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公开(公告)号：JP2002027539A
公开(公告)日：2002-01-25
申请号：JP2001184192
申请日：2001-06-19
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LAROIA RAJIV , LI JUNYI , UPPALA SATHYADEV VENKATA
Abstract: PROBLEM TO BE SOLVED: To deal with transmission of access request and transmission of paging of a mobile station and a base station in a wireless communication system by transmitting and detecting both the access request from the mobile station and the paging from the base station by using an efficient uniform method. SOLUTION: The mobile station monitors access requests and specified resources and detects whether paging is received. Upon detection of an access request, a corresponding request message is generated and is substantially immediately transmitted to the base station. In this way, the latency of access process is minimized. At the same time, the base station monitors for determining whether paging directions are received and determines whether an access request message is received by monitoring the specified resources. In this process, processing of request messages is given priority to processing of paging. Upon detection of the received request message, a request responding message is generated and is substantially immediately transmitted to the mobile station. In this way, the latency of access process is minimized.
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3.发明专利
公开(公告)号：JP2002125271A
公开(公告)日：2002-04-26
申请号：JP2001246862
申请日：2001-08-16
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LAROIA RAJIV , LI JUNYI , UPPALA SATHYADEV VENKATA
Abstract: PROBLEM TO BE SOLVED: To provide uplink traffic channel allocation using an exclusive control channel capable of ensuring the designated parts of a control channel resource for transferring uplink traffic channel requests. SOLUTION: A response to an uplink traffic channel request 1 transmitted from a traveling object device 202-1 in a group G1 is transmitted from a base station 201 between time slots S2 and S3, and received between time slots S4 and S5. The traveling object device 201-1 retransmits an uplink traffic channel request 1 in a group G2 without waiting for this response from the base station 201. Next, the traveling object device 202-1 receives the response from the base station 201. Then, the traveling object device 202-1 is able to transmit an uplink traffic channel request 2 in a group 3.
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公开(公告)号：JP2001257657A
公开(公告)日：2001-09-21
申请号：JP2001033049
申请日：2001-02-09
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LAROIA RAJIV , LI JUNYI , RANGAN SUNDEEP , UPPALA SATHYADEV VENKATA
Abstract: PROBLEM TO BE SOLVED: To provide structuring, detection and estimation technology of a signal used for uplink timing synchronization and access control in a wireless communication system adopting the orthogonal frequency division multiplex system(OFDM) or other types. SOLUTION: In an illustrative embodiment of this invention, a timing and access signal transmitted in designated timing and a designated access interval is structured with an orthogonal multi-tone signal. The multi-tone signal can be obtained similarly to the case with a multi-tone signal used for transmission of OFDM data except for correspondence of the multi-tone signal to a timing error of a mobile station not synchronized yet through the extension of a cyclic prefix related to reception of the signal by a base station.
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5.发明专利
公开(公告)号：JP2001257641A
公开(公告)日：2001-09-21
申请号：JP2001033039
申请日：2001-02-09
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LAROIA RAJIV , LI JUNYI , RANGAN SUNDEEP , UPPALA SATHYADEV VENKATA
Abstract: PROBLEM TO BE SOLVED: To provide a technology to realize uplink timing synchronization and access control with respect to a wireless communication system in general especially in a multi-access wireless communication system. SOLUTION: A mobile station of this invention transmits a general-purpose uplink access signal at any of intervals. When this access is permitted, a base station transmits access confirmation including initial timing and power correction together with designation of an initial channel at which the mobile station can start call setup process. For re-synchronization, the mobile station transmits a timing synchronizing signal in exclusive timing and at an access interval. The base station measures the arrival time of the signal and returns proper timing correction. Thus, the orthogonality between mobile stations can surely be maintained.
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Patent Agency Ranking
公开(公告)号：JP2002204204A
公开(公告)日：2002-07-19
申请号：JP2001336716
申请日：2001-11-01
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LAROIA RAJIV , LI JUNYI , UPPALA SATHYADEV VENKATA
Abstract: PROBLEM TO BE SOLVED: To efficiently support multicasting in a wireless system. SOLUTION: In a wireless communication system, a multicast message is transported to a group of wireless terminals by using a common control channel so that a multicast paging message showing that multicast traffic data are sent to the specific group of the wireless terminals is sent. In this example, essential information transmitted in the common control channel is the identifier of the group of wireless terminals intended to receive the multicast traffic data and the location of a traffic channel by which multicast traffic should be transported among channel resources and the channel resources can include the representation of band width and a time interval. When a side view of this invention is taken, the common control channel is related to the traffic channel by a specific fixed method.
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7.发明专利
公开(公告)号：JP2002094486A
公开(公告)日：2002-03-29
申请号：JP2001219076
申请日：2001-07-19
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LAROIA RAJIV , LI JUNYI , UPPALA SATHYADEV VENKATA
IPC: H04L1/00
Abstract: PROBLEM TO BE SOLVED: To provide an efficient wireless multiple access communication system. SOLUTION: This device used for the transmitter of a wireless multiple access communication system is provided with an error-detecting encoder, to which the input array of information bits is applied for generating the array of error detection redundant bits, and for generating first block bits, having the prescribed number of bits by adding the array of the error detection redundant bits to the array of information bits; a mapper, to which input block bits having the prescribed number of bits and a user index are applied, based on the first block bits for generating second block bits which have a prescribed number of bits according to the input block bits and the prescribed function of the user index; and a modulator for modulating a transmission signal, based on the second block bits for transmitting it to a user receiver.
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公开(公告)号：JP2002058065A
公开(公告)日：2002-02-22
申请号：JP2001184199
申请日：2001-06-19
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LAROIA RAJIV , LI JUNYI , UPPALA SATHYADEV VENKATA
Abstract: PROBLEM TO BE SOLVED: To achieve access request transmission in a wireless communication system by assigning specific exclusive uplink resources to respective mobile station units. SOLUTION: Channel segments accompanied with different time slot indexes and/or waveform indexes are assigned to respective mobile station units, and waveforms accompanied with the different indexes are made orthogonal. A base station is allowed to identify the mobile station which makes an access request from an exclusive uplink resource. Therefore, it is not necessary to set any mobile station identification number in an uplink request message. Then, the base station transmits a request response message which is likely to have the identification number of the request side mobile station unit on a shared downlink resource, and confirms the reception of the request. The mobile station is allowed to transmit a message for confirming the reception of a downlink request response message on the shared uplink resource.
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公开(公告)号：JP2001230753A
公开(公告)日：2001-08-24
申请号：JP2000389810
申请日：2000-12-22
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LAROIA RAJIV , LI JUNYI , UPPALA SATHYADEV VENKATA , RANGAN SUNDEEP
IPC: H04J11/00 , H04B1/7136 , H04B1/7143 , H04L5/02 , H04B1/713
Abstract: PROBLEM TO BE SOLVED: To provide radio and other communication systems using an orthogonal frequency division/multiplex system based on especially spread spectrum multiplex access. SOLUTION: In the case of a transmitter, a sequence generator and a sequence allocation device are used for generating and allocating tone sequence to a user on a time slot base by combining them with the tone allocation device of the user. In the case of a receiver, the sequence generator and the sequence allocation device are used for generating sequence and identifying input tone sequence to the user on the time slot base by combining them with the user tone identification device.
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公开(公告)号：DE60111706D1
公开(公告)日：2005-08-04
申请号：DE60111706
申请日：2001-10-23
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LAROIA RAJIV , JUNYI LI , UPPALA SATHYADEV VENKATA
Abstract: In a wireless communications system, multicast messages are transported to groups of wireless terminals by employing a common control channel to transmit a multicast paging message indicating that multicast traffic data is to be transmitted to a particular group of wireless terminals. In an embodiment of the invention, the essential information transmitted in the common control channel is the identifier of the group of wireless terminals intended to receive the multicast traffic data and the location of a traffic channel on which the multicast traffic is to be transported in a channel resource which may include a representation of bandwidth and time interval. In accordance with an aspect of the invention, the common control channel is associated with a traffic channel in a prescribed fixed manner. Further, the traffic channel used for the purpose of multicast can be the same traffic channel used for the normal point-to-point transmission of traffic data.
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