Source: http://www.google.com/patents/US20070086379?dq=6322901
Timestamp: 2018-01-20 05:40:05
Document Index: 78737708

Matched Legal Cases: ['art 510', 'art 560', 'art 510', 'art 550', 'art 520', 'art 570', 'art 530', 'art 560', 'art 510', 'art 520', 'art 570']

Patent US20070086379 - Wireless communication system and base station - Google Patents
There is provided admission control in view of wireless resources. A base station 120 obtains a down wireless resource available rate (available rate of slot allocation) based on a down QoS requested bandwidth Bi requested by a terminal i during QoS communication and a data rate Ri which the terminal...http://www.google.com/patents/US20070086379?utm_source=gb-gplus-sharePatent US20070086379 - Wireless communication system and base station
Publication number US20070086379 A1
Application number US 11/476,058
Also published as CN1949899A, CN1949899B, US7634278, US7907951, US7912478, US20100040013, US20100103817
Publication number 11476058, 476058, US 2007/0086379 A1, US 2007/086379 A1, US 20070086379 A1, US 20070086379A1, US 2007086379 A1, US 2007086379A1, US-A1-20070086379, US-A1-2007086379, US2007/0086379A1, US2007/086379A1, US20070086379 A1, US20070086379A1, US2007086379 A1, US2007086379A1
Inventors Daigo Takayanagi, Kiyoshi Kawamoto, Shiro Mazawa
Original Assignee Daigo Takayanagi, Kiyoshi Kawamoto, Shiro Mazawa
US 20070086379 A1
There is provided admission control in view of wireless resources. A base station 120 obtains a down wireless resource available rate (available rate of slot allocation) based on a down QoS requested bandwidth Bi requested by a terminal i during QoS communication and a data rate Ri which the terminal can receive. A down wireless resource usage rate necessary to ensure the requested bandwidth B is obtained by dividing a down QoS requested bandwidth B requested by the terminal trying to perform QoS communication by the data rate R which the terminal can receive. The base station 120 obtains an up wireless resource available rate based on ROT of an up channel and a threshold value T1 indicating an allowable upper limit of the ROT. Besides, an up wireless resource usage rate necessary to ensure an up requested bandwidth requested by the terminal is obtained. The QoS communication is performed on the terminal in which the up and down wireless resource available rates are respectively equal to or more than the up and down wireless resource usage rates.
1. A base station in a wireless communication system comprising the base station to communicate with a terminal by wireless and by time division multiplexing, and a node to perform best effort communication and QoS communication with the terminal through the base station,
1 - ∑ i B i R i
2. A base station in a wireless communication system comprising the base station to communicate with a terminal by wireless and by code division multiplexing, and a node to perform best effort communication and QoS communication with the terminal through the base station,
3. A base station in a wireless communication system comprising the base station to communicate with a terminal by wireless, by time division multiplexing in a downward direction to the terminal, and by code division multiplexing in an upward direction from the terminal, and a node to perform best effort communication and QoS communication with the terminal through the base station,
4. The base station according to claim 1, wherein the base station further comprises
5. The base station according to claim 2, wherein the base station further comprises
6. A base station in a wireless communication system comprising the base station having a first and a second channels and communicating with a terminal by wireless and by time division multiplexing, and a node to perform best effort communication and QoS communication with the terminal, wherein
∑ i B i R i
∑ k B k R k
7. A base station in a wireless communication system comprising the base station having a first and a second channels and communicating with a terminal by wireless and by code division multiplexing, and a node to perform best effort communication and QoS communication with the terminal, wherein
8. The base station according to claim 6, wherein
in a case where the obtained second wireless resource usage rate of the second terminal is larger than the previously determined second threshold value, the base station changes the second terminal from the QoS communication to the best effort communication.
10. The base station according to claim 6, further comprising:
the control part stores the second requested bandwidth received from the node into the requested bandwidth storage part, the control part obtains a wireless resource available rate, based on a first requested bandwidth Bi which is stored in the requested bandwidth storage part and is requested by the first terminal i and a first data rate Ri which the first terminal i can receive and which is stored in the data rate reception management part, by a following expression:
An index of a wireless resource usage rate is provided. The index is managed for each terminal and each channel, and the judgment as to whether or not QoS can be provided is made by using the index. (1) According to one of the solving means of the invention, the index of the wireless resource usage rate is provided, a wireless resource available rate of a channel and a wireless resource usage rate necessary to ensure a requested bandwidth of a terminal requesting connection are compared with each other at the time of QoS call connection, and the QoS call connection is performed when the available rate is larger.
the control part obtains a wireless resource available rate, based on a first requested bandwidth Bi which is stored in the requested bandwidth storage part and is requested by the first terminal i, and a first data rate Ri which the first terminal i can receive and which is stored in the data rate reception management part, by a following expression: 1 - ∑ i B i R i
(Io+No)/No
here, Io is total of received power from all terminals, No is thermal noise power,
the control part obtains a down wireless resource available rate, based on a first down requested bandwidth Bi which is stored in the requested bandwidth storage part and is requested by the first terminal i, and a first data rate Ri which the first terminal i can receive and which is stored in the data rate reception management part, by a following expression: 1 - ∑ i B i R i
According to the fourth solving means of this invention, there is provided
the base station obtains a third wireless resource usage rate in the second channel, based on a third requested bandwidth Bk requested by one or plurality of third terminals k during QoS communication through the second channel and a third data rate Rk which the third terminal k can receive, which depends on changing a data amount stored in each time slot according to wireless environment, by a following expression: ∑ k B k R k
where, A is a ratio of total transmission power to transmission power of a pilot channel when the second terminal transmits data in the requested bandwidth., and uniquely determined according to the requested bandwidth, P is S/N of the pilot channel of the second terminal, Ta is ROT of the first channel, and T1 is a previously determined first ROT threshold value indicating an allowable upper limit of ROT,
According to the sixth solving means of this invention, there is provided
the control part stores the second requested bandwidth received from the node into the requested bandwidth storage part, the control part obtains a wireless resource available rate, based on a first requested bandwidth Bi which is stored in the requested bandwidth storage part and is requested by the first terminal i and a first data rate Ri which the first terminal i can receive and which is stored in the data rate reception management part, by a following expression: 1 - ∑ i B i R i
According to the seventh solving means of this invention, there is provided
the node refers to the QoS information table and transmits a requested bandwidth corresponding to the identifier of the second terminal included in the establishment request to the base station, the control part stores the second requested bandwidth received from the node into the requested bandwidth storage part, the control part obtains a wireless resource available rate, based on a value T of ROT of a channel stored in the ROT management part and a threshold value T1 stored in the threshold value storage part, by a following expression:
DETAILED ON OF THE PREFERRED EMBODIMENTS OF THE INVENTION
A description will be made while as a wireless communication system, a 1xEV-DO (1x Evolution Data Only) system is used as an example.
Besides, the slot allocation rate of all channels becomes as follows. ∑ i B i R i ( 2 )
The wireless resource usage rate of the ith terminal 110 in the channel is the extent of contribution of the terminal 110 in the ROT of all the channels, and becomes as follows. A i ⨯ P i ⨯ T T 1 ( 4 )
Here, Ai denotes the ratio of the total transmission power to the transmission power of the pilot channel when the terminal i transmits data in the up QoS requested bandwidth, and has a unique correspondence relation to the up QoS requested bandwidth. Pi denotes the S/N of the pilot channel of the terminal i which the base station 120 receives. Ai is uniquely obtained based on the QoS requested bandwidth and is stored in the requested bandwidth storage part 510. Pi is received and stored in the S/N reception-management part 560.
The base station 120 calculates, with respect to each of the up and down transmissions, the wireless resource available rate of the channel through which the best effort call of the terminal 110 is provided (processing 703, processing 704). The wireless resource available rate of the channel is obtained from the wireless resource usage rate of 1 channel. The wireless resource usage rate of the channel in the down transmission is calculated by the foregoing expression (2) using the down QoS requested bandwidth Bi of each terminal i stored in the requested bandwidth storage part 510 and the time average Ri of the receivable data rate of each terminal i managed by the receivable data rate reception-management part 550. The wireless resource usage rate in the up transmission is calculated by expression (3) using the ROT threshold value T1 stored in the ROT threshold value storage part 520 and the value T of ROT received in the ROT reception-management part 570. That is, the wireless resource available rate of the down channel is 1 - ∑ i B i R i
and the wireless resource available rate of the up channel is
1−T/T1
where, i denotes all terminals (first terminals) which perform QoS communication with the base station 120.
Specifically, the base station 120 (for example, the control part 530) acquires the corresponding S/N value from the S/N reception-management part 560 based on the terminal registration number received in processing 201 or the terminal registration number included in the connection establishment instruction for QoS and received in processing 205, and acquires Ai corresponding to the foregoing terminal registration number from the requested bandwidth storage part 510. Besides, the base station 120 acquires the ROT threshold value T1 stored in the ROT threshold value storage part 520 and the value of ROT, stored in the ROT reception-management part 570, of the channel through which the terminal 110 communicates The base station 120 obtains the up wireless resource usage rate of the terminal 110 by expression (4).
On the other hand, in the up transmission, the following expression may be used in which an average PAVE of S/N of pilot signals received in the base station 120 in the channel and over all the terminals 110 is used instead of Pi in the expression (4). A i ⨯ P AVE ⨯ T T 1 ( 6 )
First, the down processing will be described. At processing 412, first, based on a first down QoS requested bandwidth Bi requested by one or plural first terminals i during QoS communication through the first channel, and a first data rate Ri which the first terminal i can receive and which depends on changing the data amount stored in each time slot according to wireless environment, the base station 120 obtains a first down wireless resource usage rate in the first channel by the following expression. ∑ i B i R i
In processing 413, first, based on a third down QoS requested bandwidth Bk requested by one or plural third terminals k during QoS communication in the second channel, and a third data rate Rk predicted value = ∑ i B i R i - B R ( 7 ' )
which the third terminal k can receive and which depends on data amount stored in each time slot and changed according to wireless environment, the base station 120 obtains a third down wireless resource usage rate in the second channel by the following expression. ∑ k B k R k
Besides, the base station 120 obtains a fourth down wireless resource usage rate of the second terminal after the second terminal hands off to the second channel by dividing the second down QoS requested bandwidth B requested by the second terminal by the average RAVE of the third data rate Rp (B/RAVE) which each terminal 110 communicating through the second channel can receive. The base station 120 obtains a predicted value of a down wireless resource usage rate in the second channel after the second terminal hands off to the second channel by adding the fourth down wireless resource usage rate of the second terminal to the third down wireless resource usage rate in the second channel. That is, the predicted value of the down wireless resource usage rate of the handoff destination (second channel) after the handoff is expressed by the following expression.
In the case where both the obtained predicted value of the predicted value = ∑ k B k R k + B R AVE ( 8 ′ )
down wireless resource usage rate in the first channel and the predicted value of the down wireless resource usage rate in the second channel respectively become the previously determined threshold values (for example, 1) or less (processing 414), the base station 120 hands of f the second terminal from the first channel to the second channel (processing 415).
A×P×Ta/T1
where, A: a ratio of the total transmission power to transmission power of a pilot channel when the second terminal transmits data in the up QoS requested bandwidth, which is a value uniquely determined according to the up QoS requested bandwidth, P: S/N of the pilot channel of the second terminal, Ta: ROT of the first channel, and T1: previously determined first threshold value indicating the allowable upper limit of ROT.
predicted value=T a /T 1 −A×P×T a /T 1. (7″)
A×PAVE×Tb/T2
where, A: a ratio of the total transmission power to transmission power of the pilot channel when the second terminal transmits data in the up QoS requested bandwidth, which is a value uniquely determined according to the up QoS requested bandwidth, PAVE: an average of S/N of the pilot channel of all the terminals 110 communicating through the second channel, Tb: ROT of the second channel, and T2: a previously determined second threshold value indicating an allowable upper limit of ROT.
predicted value=T b /T 2 +A×P AVE ×T b /T 2. (8)
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U.S. Classification 370/329, 370/458, 455/561
International Classification H04W28/20, H04W88/08
Cooperative Classification H04W28/22, H04W88/08, H04W28/20
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:TAKAYANAGI, DAIGO;KAWAMOTO, KIYOSHI;MAZAWA, SHIRO;REEL/FRAME:018297/0757;SIGNING DATES FROM 20060703 TO 20060704