Base transceiver station

• US 7,675,887 B2
• Filed: 03/29/2006
• Issued: 03/09/2010
• Est. Priority Date: 03/30/2005
• Status: Expired due to Fees

• Current Assignee: Hitachi Kokusai Electric Incorporated (Hitachi, Ltd.)
• Original Assignee: Hitachi Kokusai Electric Incorporated (Hitachi, Ltd.)
• Inventors: Hoshina, Koya
• Primary Examiner(s): RAMPURIA, SHARAD K
• Application Number:
  US11/391,176
• Publication Number:
  US 20060221908A1
• Time in Patent Office: 1,441 Days
• Field of Search: 455560-5621, 455450-4522, 455524-525, 370/335, 370/342, 375/148
• US Class Current: 370/335
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 2201/70705 Rate detection
• CPC Class Codes: H04B 2201/7071 with dynamic control of receiver resources
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

On the basis of a spreading factor obtained by despreading a control channel of received data by a control channel despreading unit, a spreading factor determination unit determines a transmission rate of the received data. User data subjected to despreading processing at a user data despreading unit is demodulated by a demodulator and temporarily stored in a demodulated data memory. The user data read from the demodulated data memory is decoded by a decoder, whereas the result of decoding by the decoder is supplied to a delay measurement unit, where a delay time relative to the above processing, of the user data is detected. A channel resource management unit manages the number of available resources at all times or in a constant cycle on the basis of transmission rates of respective radio channels detected by the spreading factor determination unit and delay processing times of the respective radio channels detected by the delay measurement unit.

Claims

1. A base transceiver station comprising:

a receiving section which receives spectrum spread data therein;

a spreading factor determination unit which extracts a transmission format of the spectrum spread data received by the receiving section and calculates a spreading factor from the transmission format;

a baseband signal receiver which despreads and decodes the spectrum spread data, based on the transmission format of the spectrum spread data;

a measurement unit which calculates a processing time of said decoding taken at the baseband signal receiver; and

a channel resource management unit which manages each of resources on the basis of the spreading factor calculated by the spreading factor determination unit and the processing time of decoding calculated by the measurement unit, and performs a new call setting.

2. A base transceiver station according to claim 1, wherein said management unit measures a processing time at said base transceiver station by calculating a difference between a start timing and an end timing for the decoding processing.

3. A base transceiver station according to claim 1, wherein said channel resource management unit holds a prescribed processing time at the base transceiver station and compares a threshold value calculated from said prescribed processing time at the base transceiver station and the processing time of said decoding calculated at said measurement unit, and when the processing time of decoding exceeds the threshold value the reception of a new call is not carried out.

4. A base transceiver station according to claim 1, wherein said channel resource management unit manages the resources of the base transceiver station every slot used as the minimum units of the spectrum spread data received by the receiving station.

5. A base transceiver station according to claim 1, wherein said channel resource management unit manages the resources of the base transceiver station every radio frame each comprising a plurality of the slots used as the minimum units of the spectrum spread data received by the receiving section.

6. A base transceiver station comprising:

a receiving section which receives spectrum spread data which comprises user data of a data channel and control information of a control channel both brought into multiplexed form;

a spreading factor determination unit which extracts a transmission format by despreading the control information of the control channel as spectrum spread data received by the receiving section and calculates a spreading factor from the transmission format;

a baseband signal receiver which despreads and decodes user data of the data channel as the spectrum spread data, based on the transmission format;

a measurement unit which calculates a processing time of said decoding of the user data of the data channel taken at the baseband signal receiver; and

a channel resource management unit which manages each of resources on the basis of the spreading factor calculated by the spreading factor determination unit and the processing time of decoding calculated by the measurement unit, and performs a new call setting.

7. A base transceiver station according to claim 6, wherein said measurement unit measures a processing time at said base transceiver station by calculating a difference between a start timing and an end timing for the decoding processing.

8. A base transceiver station according to claim 6, wherein said channel resource management unit holds a prescribed processing time at the base transceiver station and compares a threshold value calculated from said prescribed processing time at the base transceiver station and the processing time of said decoding calculated at said measurement unit, and when the processing time of decoding exceeds the threshold value the reception of a new call is not carried out.

9. A base transceiver station according to claim 6, wherein said channel resource management unit manages the resources of the base transceiver station every slot used as the minimum units of the spectrum spread data received by the receiving section.

10. A base transceiver station according to claim 6, wherein said channel resource management unit manages the resources of the base transceiver station every radio frame each comprising a plurality of the slots used as the minimum units of the spectrum spread data received by the receiving section.

11. A base transceiver station comprising:

a receiving section which receives therein spectrum spread data on dedicated channels allocated every mobile stations, and spectrum spread data on common channels transmitted on a time-division multiplexing basis from a plurality of the mobile stations by allocating the mobile stations every time slots;

a spreading factor determination unit, which extracts transmission formats of the spectrum diffusion data on the dedicated channels received by the receiving section and calculates spreading factors from the transmission formats and extracts transmission formats of the spectrum spread data set every time slots of the common channel, received by the receiving section and calculates spreading factors of the received data of the time slots from the transmission formats;

a baseband signal receiver which despreads and decodes the spectrum spread data on the dedicated and common channels on the basis of the transmission formats of the spectrum spread data on the dedicated and common channels;

a measurement unit which calculates times for processing of said decoding of received data on the dedicated and common channels at the baseband signal receiver; and

a channel resource management unit which manages resources relative to the dedicated and common channels on the basis of the spreading factors calculated by the spreading factor determination unit and the processing times of said decoding calculated by the measurement unit and performs a new call setting,

wherein the baseband signal receiver comprises,

a user channel despreading unit for said each dedicated channel, which despreads the spectrum spread data of a user channel for each dedicated channel on the basis of the transmission format of the spectrum spread data on said each dedicated channel,

a demodulator for said each dedicated channel, which demodulates user data on said each dedicated channel, obtained by the despreading processing of the user channel despreading unit for said each dedicated channel,

a user channel despreading unit for the common channel, which despreads the spectrum spread data on user channels set every said time slots of the common channel on the basis of the transmission formats of the spectrum spread data on the user channels set every said time slots of the common channel,

a demodulator for the common channel, which demodulates user data set every said time slots of the common channel, obtained by the despreading processing of the user channel despreading unit for the common channel,

a demodulated data memory which stores therein the demodulated user data outputted from the demodulator for said each dedicated channel and the demodulator for the common channel, and

a decoder which decodes the user data stored in a predetermined amount in the demodulated data memory;

wherein the user data on the dedicated and common channels are decoded by the decoder common thereto, and the measurement unit calculates a processing time of said decoding at the decoder.

12. A base transceiver station according to claim 11, wherein said measurement unit measures a processing time at said base transceiver station by calculating a difference between a start timing and an end timing for the decoding processing.

13. A base transceiver station according to claim 11, wherein said channel resource management unit holds a prescribed processing time at the base transceiver station and compares a threshold value calculated from said prescribed processing time at the base transceiver station and the processing time of said decoding calculated at said measurement unit, and when the processing time of decoding exceeds the threshold value the reception of a new call is not carried out.

14. A base transceiver station according to claim 11, wherein said channel resource management unit manages the resources of the base transceiver station every slot used as the minimum units of the spectrum spread data received by the receiving station.

15. A base transceiver station according to claim 11, wherein said channel resource management unit manages the resources of the base transceiver station every radio frame each comprising a plurality of the slots used as the minimum units of the spectrum spread data received by the receiving section.