Telecommunication system with transmit and multi-user diversity

• US 7,890,114 B2
• Filed: 09/17/2003
• Issued: 02/15/2011
• Est. Priority Date: 09/27/2002
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Hoek, Cornelis, Braun, Volker
• Primary Examiner(s): Edouard; Patrick N
• Assistant Examiner(s): WIN, AUNG T
• Application Number:
  US10/663,772
• Publication Number:
  US 20040063437A1
• Time in Patent Office: 2,708 Days
• Field of Search: 370/342, 370/310, 370/431, 370/464, 370/329, 455/450, 455/509, 455/451, 455/452.1, 455/452.2, 455/463, 455/464
• US Class Current: 455/450
• CPC Class Codes: H04B 7/0615 of weighted versions of same signal

Abstract

The present invention relates to a method of sending first and second signals to a plurality of user equipments, the method comprising the steps of providing of a dedicated channel for each one of the plurality of user equipments, providing of a code-multiplexed shared channel for the plurality of user equipments, assigning of an antenna of a set of antennas to each one of the user equipments, sending of one of the first signals to one of the plurality of user equipments on one of the dedicated channels on a carrier frequency by applying transmit diversity, sending of one of the second signals to one of the plurality of user equipments on the code-multiplexed shared channel on the carrier frequency by applying multi-user diversity.

Claims

1. A method of sending first and second signals to a plurality of user equipments, the method comprising:

providing a dedicated channel for each one of the plurality of user equipments,

providing a code-multiplexed shared channel for the plurality of user equipments,

splitting the plurality of user equipments substantially evenly into a first group of user equipments which are assigned to a first carrier frequency and into a second group of user equipments which are assigned to a second carrier frequency,

receiving first signals which are to be transmitted on dedicated channels being assigned to the first carrier frequency to provide two first signal components for transmit diversity;

receiving second signals which are to be transmitted on dedicated channels being assigned to the second carrier frequency to provide two second signal components for transmit diversity;

first code-multiplexing third signals to be sent to the first group of user equipments to provide two third signal components for multi-user diversity;

second code-multiplexing fourth signals to be sent to the second group of user equipments to provide two fourth signal components for multi-user diversity;

first adding one of the first signal components, one of the second signal components, one of the third signal components, and one of the fourth signal components;

second adding the other one of the first signal components, the other one of the second signal components, the other one of the third signal components, and the other one of the fourth signal components; and

first power-amplifying a result of the first adding to transmit the first power-amplified signal via a first antenna;

second power-amplifying a result of the second adding to transmit the second power-amplified signal via a second antenna;

wherein the first carrier frequency and the second carrier frequency are alternately assigned to the plurality of user equipments in an order in which the plurality of user equipments become active,

wherein each of the first and second signals is assigned to either the first carrier frequency or to the second carrier frequency,

wherein each of the user equipments is assigned to one of the first and second carrier frequencies and to one of the first and second antennas,

wherein the first and second signals are real time signals and the third and fourth signals are non-real time signals, the real time signals including at least one of voice signals and video signals.

2. The method of claim 1, wherein the dedicated channel is a DPCH type channel and the code-multiplexed shared channel is a HS-DSCH type channel of a HSDPA type system.

3. The method of claim 1, further comprising:

assigning a carrier frequency of a set of at least first and second carrier frequencies to each one of the dedicated channels,

assigning a carrier frequency of the set of carrier frequencies to each one of the plurality of user equipments.

4. The method of claim 3, further comprising applying transmit diversity for sending of the one of the second signals.

5. The method of claim 4, wherein closed loop transmit diversity is applied for the third and fourth signals on a predetermined channel condition.

6. A non-transitory computer readable recording medium having tangibly stored thereon a computer program for enabling a computer to control a sending of first and second signals to a plurality of user equipments, the program comprising:

providing a dedicated channel for each one of the plurality of user equipments,

providing a code-multiplexed shared channel for the plurality of user equipments,

splitting the plurality of user equipments substantially evenly into a first group of user equipments which are assigned to a first carrier frequency and into a second group of user equipments which are assigned to a second carrier frequency

receiving first signals which are to be transmitted on dedicated channels being assigned to the first carrier frequency to provide two first signal components for transmit diversity;

receiving second signals which are to be transmitted on the dedicated channels being assigned to the second carrier frequency to provide two second signal components for transmit diversity;

first code-multiplexing third signals to be sent to the first group of user equipments to provide two third signal components for multi-user diversity;

second code-multiplexing fourth signal to be sent to the second group of user equipments to provide two fourth signal components for multi-user diversity;

first adding one of the first signal components, one of the second signal components, one of the third signal components, and one of the fourth signal components;

second adding the other one of the first signal components, the other one of the second signal components, the other one of the third signal components, and the other one of the fourth signal components; and

first power-amplifying a result of the first adding to transmit the first power-amplified signal via a first antenna;

second power-amplifying a result of the second adding to transmit the second power-amplified signal via a second antenna;

wherein the first carrier frequency and the second carrier frequency are alternately assigned to the plurality of user equipments in an order in which the plurality of user equipments become active,

wherein each of the first and second signals is assigned to either the first carrier frequency or to the second carrier frequency,

wherein each of the user equipments is assigned to one of the first and second carrier frequencies and to one of the first and second antennas,

wherein the first and second signals are real time signals and the third and fourth signals are non-real time signals, the real time signals including at least one of voice signals and video signals.

7. A transmitter which sends first and second signals to a plurality of user equipments, the transmitter comprising:

a first component which provides a dedicated channel for each one of the plurality of user equipments,

a second component which provides a code-multiplexed shared channel to the plurality of user equipments,

a third component which splits the plurality of user equipments substantially evenly into a first group of user equipments which are assigned to a first carrier frequency and into a second group of user equipments which are assigned to a second carrier frequency,

a fourth component which receives first signals which are to be transmitted on dedicated channels being assigned to the first carrier frequency to provide two first signal components for transmit diversity;

a fifth component which receives second signals which are to be transmitted on the dedicated channels being assigned to the second carrier frequency to provide two second signal components for transmit diversity;

a sixth component which code-multiplexes third signals to be sent to the first group of user equipments to provide two third signal components for multi-user diversity;

a seventh component which code-multiplexes fourth signals to be sent to the second group of user equipments to provide two fourth signal components for multi-user diversity;

an eighth component which adds one of the first signal components, one of the second signal components, one of the third signal components, and one of the fourth signal components;

a ninth component which adds the other one of the first signal components, the other one of the second signal components, the other one of the third signal components, and the other one of the fourth signal components;

a tenth component which power-amplifies an adding result of the eighth component to transmit the first power-amplified signal via a first antenna; and

an eleventh component which power-amplifies an adding result of the ninth component to transmit the second power-amplified signal via a second antenna,

wherein the first carrier frequency and the second carrier frequency are alternately assigned to the plurality of user equipments in an order in which the plurality of user equipments become active,

wherein each of the first and second signals is assigned to either the first carrier frequency or to the second carrier frequency,

wherein each of the user equipments is assigned to one of the first and second carrier frequencies and to one of the first and second antennas,

wherein the first and second signals are real time signals and the third and fourth signals are non-real time signals, the real time signals including at least one of voice signals and video signals.

8. The transmitter of claim 7, further comprising scheduler which provides the multi-user diversity.

9. The transmitter of claim 7, further comprising:

means for assigning a carrier frequency of a set of at least first and second carrier frequencies to each one of the dedicated channels,

means for assigning of a carrier frequency of a set of carrier frequencies to each one of the user equipments.

10. A telecommunication system for sending first and second signals to a plurality of user equipments, the telecommunication system comprising:

a first component which provides a dedicated channel for each one of the plurality of user equipments,

a second component which provides a code-multiplexed shared channel for the plurality of user equipments,

a third component which splits the plurality of user equipments substantially evenly into a first group of user equipments which are assigned to a first carrier frequency and into a second group of user equipments which are assigned to a second carrier frequency,

a fourth component which receives first signals which are to be transmitted on dedicated channels being assigned to the first carrier frequency to provide two first signal components for transmit diversity;

a fifth component which receives second signals which are to be transmitted on the dedicated channels being assigned to the second carrier frequency to provide two second signal components for transmit diversity;

a sixth component which code-multiplexes third signals to be sent to the first group of user equipments to provide two third signal components for multi-user diversity;

a seventh component which code-multiplexes fourth signals to be sent to the second group of user equipments to provide two fourth signal components for multi-user diversity;

an eighth component which adds one of the first signal components, one of the second signal components, one of the third signal components, and one of the fourth signal components;

a ninth component which adds the other one of the first signal components, the other one of the second signal components, the other one of the third signal components, and the other one of the fourth signal components;

a tenth component which power-amplifies an adding result of the eighth component to transmit the first power-amplified signal via a first antenna; and

an eleventh component which power-amplifies an adding result of the ninth component to transmit the second power-amplified signal via a second antenna

wherein the first carrier frequency and the second carrier frequency are alternately assigned to the plurality of user equipments in an order in which the plurality of user equipments become active,

wherein each of the first and second signals is assigned to either the first carrier frequency or to the second carrier frequency,

wherein each of the user equipments is assigned to one of the first and second carrier frequencies and to one of the first and second antennas,

wherein the first and second signals are real time signals and the third and fourth signals are non-real time signals, the real time signals including at least one of voice signals and video signals.