Methods and network nodes in a wireless communication network for handling of uplink signals sent by a user equipment

Patent metadata

Field	Value
Publication number	US-10028183-B2
Application number	US-201415504315-A
Country	US
Kind code	B2
Filing date	Oct 3, 2014
Priority date	Oct 3, 2014
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

A method performed by a first network node of a wireless communication network for handling uplink signals sent by a UE. The wireless communication network comprises a serving network node responsible for transmitting downlink signals to the UE, and a non-serving network node capable of receiving uplink signals sent by the UE. The non-serving network node is the first network node and the serving network node is a second network node of the communication network, or vice versa. The method comprises receiving an uplink signal from the UE, measuring signal quality on the received uplink signal, and receiving signal quality information from the second network node regarding signal quality measured by the second network node on the uplink signal received by the second network node, to detect imbalances in experienced signal quality between the first network node and the second network node.

First claim

The invention claimed is:

1. A method performed by a first network node of a wireless communication network for handling uplink signals sent by a user equipment (UE) wherein the wireless communication network comprises a serving network node responsible for transmitting downlink signals to the UE, and a non-serving network node capable of receiving uplink signals sent by the UE, wherein the non-serving network node is the first network node and the serving network node is a second network node of the communication network, or the non-serving network node is the second network node and the serving network node is the first network node, the method comprising:
receiving an uplink signal from the UE, the signal comprising information representing a dedicated physical channel dedicated for the UE;
measuring signal quality on the received uplink signal;
receiving signal quality information from the second network node regarding signal quality measured by the second network node on the uplink signal received by the second network node, thus enabling detection in the first network node of imbalances in experienced signal quality between the first network node and the second network node,
wherein during a handover of the UE from the serving network node to the non-serving network node, the first network node, when operating as the serving network node, adjusts its signal quality target to ensure reception of the uplink signal at the second network node and, when operating as the non-serving network node, has the UE adjust its uplink signal to ensure reception of the uplink signal at the second network node.

2. The method according to claim 1 , wherein the measured signal quality is signal to interference ratio (SIR) and the received signal quality information is received SIR information.

3. The method according to claim 2 , further comprising:
modifying an uplink SIR target of the first network node based on the measured first network node SIR and the received second network node SIR information.

4. The method according to claim 3 , further comprising:
sending a request to a radio network controller (RNC) to which the first network node is connected, the request requesting the RNC not to alter the modified SIR target of the first network node.

5. The method according to claim 1 , wherein the received signal quality information is a signal quality value measured at the second network node.

6. The method according to claim 1 , wherein the received signal quality information is a value of a difference between a signal quality target of the second network node and a signal quality measured by the second network node.

7. The method according to claim 1 , wherein the wireless communication network is a heterogeneous network, the serving network node is a high power node and the non-serving network node is a low power node transmitting wireless signals with a lower power than the high power node.

8. The method according to claim 1 , wherein the signal quality information received from the second network node comprises at least some of the following information: the second network node identifier, the UE identifier, the measured dedicated physical channel signal quality or difference between the measured dedicated physical channel signal quality and target dedicated physical channel signal quality at the second network node, and information whether the second network node is the serving network node or the non-serving network node for the UE.

9. A first network node of a wireless communication network, configured for handling uplink signals sent by a user equipment (UE) wherein the wireless communication network comprises a serving network node responsible for transmitting downlink signals to the UE, and a non-serving network node capable of receiving uplink signals sent by the UE, wherein the non-serving network node is the first network node and the serving network node is a second network node, or the non-serving network node is the second network node and the serving network node is the first network node, the first network node comprising:
a processor; and
a memory coupled to the processor, said memory containing instructions, which when executed by said processor, cause the first network node to:
receive an uplink signal from the UE, the signal comprising information representing a dedicated physical channel dedicated for the UE;
measure signal quality on the received uplink signal; and
receive signal quality information from the second network node regarding signal quality measured by the second network node on the uplink signal received by the second network node, thus enabling detection in the first network node of imbalances in experienced signal quality between the first network node and the second network node,
wherein during a handover of the UE from the serving network node to the non-serving network node, the first network node, when operating as the serving network node, adjusts its signal quality target to ensure reception of the uplink signal at the second network node and, when operating as the non-serving network node, has the UE adjust its uplink signal to ensure reception of the uplink signal at the second network node.

10. The first network node according to claim 9 , wherein the measured signal quality is signal to interference ratio (SIR) and the received signal quality information is received SIR information.

11. The first network node according to claim 10 , wherein said memory further contains instructions, which when executed by said processor, cause the first network node to modify an uplink SIR target of the first network node based on the measured first network node SIR and the received second network node SIR information.

12. The first network node according to claim 11 , wherein said memory further contains instructions, which when executed by said processor, cause the first network node to send a request to a radio network controller (RNC) to which the first network node is connected, the request requesting the RNC not to alter the modified SIR target of the first network node.

13. The first network node according to claim 9 , wherein the received signal quality information is a signal quality value measured at the second network node.

14. The first network node according to claim 9 , wherein the received signal quality information is a value of a difference between a signal quality target of the second network node and a signal quality measured by the second network node.

15. The first network node according to claim 9 , wherein the wireless communication network is a heterogeneous network, the serving network node is a high power node and the non-serving network node is a low power node transmitting wireless signals with a lower power than the high power node.

16. The first network node according to claim 9 , wherein the signal quality information received from the second network node comprises at least some of the following information: the second network node identifier, the UE identifier, the measured dedicated physical channel signal quality or difference between the measured dedicated physical channel signal quality and target dedicated physical channel signal quality at the second network node, and information whether the second network node is the serving network node or the non-serving network node for the UE.

17. A non-transitory computer readable storage medium having computer code stored therein, which when run on a processor in a first network node operable in a wireless communication network, cause the first network node to perform operations co

Assignees

• Ericsson Telefon Ab L M

Inventors

• Ankel Pär
• Egnell Henrik
• Hogan Billy
• Lamm Anders
• Larsson Erik

Classifications

• H04W72/21

  in the uplink direction of a wireless link, i.e. towards the network · CPC title

• H04W36/20

  for optimising the interference level · CPC title

• H04W72/0413

  Electricity · mapped topic

• H04W36/0083 Primary

  Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists · CPC title

• H04W36/18

  for allowing seamless reselection, e.g. soft reselection · CPC title