Terminal State Management in a Telecommunications Network

• US 20120057663A1
• Filed: 04/30/2010
• Published: 03/08/2012
• Est. Priority Date: 04/30/2009
• Status: Abandoned Application

• Current Assignee: ST-Ericcson SA (Telefonaktiebolaget LM Ericsson)
• Original Assignee: ST-Ericcson SA (Telefonaktiebolaget LM Ericsson)
• Inventors: Bouyaud, Mickael
• Application Number:
  US13/266,185
• Publication Number:
  US 20120057663A1
• Time in Patent Office: Days
• US Class Current: 375/343
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 2201/70701 featuring pilot assisted reception

Abstract

A signal transmitted in a radio telecommunications network is received (41). This radio signal carries a common pilot channel and another channel, with said other channel carrying state information. Then one obtains (42), from the radio signal, a first signal by channel estimation on the common pilot channel and a second signal by correlation of the received radio signal with a reference code. Next, a resulting signal is obtained (43) by complex conjugate multiplication of the first signal with the second signal. Lastly, a value for the state information indicated in the second signal is determined (44) on the basis of the resulting signal.

Claims

1. A method for receiving signal transmitted in a radio telecommunications network, said method comprising the following steps executed in a receiving unit:

receiving a radio signal carrying a common pilot channel (CPICH) and another channel (PICH), said common pilot channel carrying out a predefined reference signal and said other channel carrying state information;

obtaining, from the radio signal, a first signal by channel estimation on the common pilot channel as a function of a code used on said common pilot channel and predefined reference signal transmitted on said common pilot channel; and

a second signal by correlation of the received radio signal with a reference code;

obtaining a resulting signal by complex conjugate multiplication of the first signal with the second signal; and

determining a value for the state information indicated in the second signal on the basis of the resulting signal.

2. The method for receiving signal according to claim 1, wherein the channel estimation on the common pilot channel and the correlation of the received radio signal are done in parallel on the received radio signal.

3. The method for receiving signal according to claim 1, wherein the channel estimation on the common pilot channel and the correlation of the received radio signal are done sequentially over time on the received radio signal.

4. The method for receiving signal according to claim 1, wherein, as the resulting signal has complex components respectively corresponding to samples of the received signal, a value for the state information is determined on the basis of a sum of said complex components.

5. The method for receiving signal according to claim 4, wherein a value for the state information is determined on the basis of a sum of complex components selected from among the complex components of the resulting signal.

6. The method for receiving signals according to claim 4, wherein a value for the state information is determined on the basis of a sum of the real parts of complex components.

7. A signal receiving unit comprising a means for executing the steps of the method for receiving signal according to claim 1.

8. The signal receiving unit according to claim 7, comprising:

a receiving unit adapted to receive a radio signal carrying a common pilot channel (CPICH), said common pilot channel carrying out a predefined reference signal and another channel (PICH), said other channel carrying state information (PI);

a first obtaining unit adapted to obtain, from the radio signal, a first signal by channel estimation on the common pilot channel as a function of a code used on said common pilot channel and predefined reference signal transmitted on said common pilot channel; and

a second signal by correlation of the received radio signal with a reference code;

a second obtaining unit adapted to obtain a resulting signal by complex conjugate multiplication of the first signal with the second signal; and

a determination unit adapted to determine a value for the state information indicated in the second signal on the basis of the resulting signal.

9. The signal receiving unit according to claim 8, wherein some of the units correspond to an integrated circuit and the other unit or units correspond to a microprocessor.

10. A terminal comprising a signal receiving unit according to claim 9.

11. A system comprising at least one base station adapted to emit a radio signal carrying a common pilot channel (CPICH) and another channel (PICH), said other channel carrying state information (PI), and a terminal according to claim 10.