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US 7,248,875 B2Granted
Method and system to optimise soft handover gain in networks
AssigneeNokia Corporation
InventorsHarmen Schreuder, Theodore Buot, Houtao Zhu
Life of this patent
Estimating the term…
Abstract
The invention provides a method, system, and network entity for improving Soft Handover (SHO) Gain in networks, preferably in CDMA networks, comprising the step of determining the network performance in the UL (uplink) or in the DL (downlink), or both in the UL (uplink) and in the DL (downlink), and of measuring and tuning at least one or more of those parameters, preferably system outputs, that are directly related to SHO Gain, so as to control, preferably maximise, SHO Gain. The determination of the network performance provides an indicator of when and where SHO Gains are needed. The invention can be implemented in the RNC and/or BS and can e.g. be part of RAN, e.g. an UTRAN solution as well as IP RAN.
Claims31
A method for improving soft handover Gain, comprising:
- determining the network performance in the uplink or in the downlink, or both in the uplink and in the downlink;
- and
- measuring and tuning at least one or more of those parameters that are directly related to soft handover Gain, so as to control soft handover Gain,
- wherein, if the network is coverage limited, the method starts with adjusting soft handover parameters,
- wherein the soft handover parameters are 1) soft handover windowAdd, 2) windowDrop, and 3) activeSetSize.
2 more elements
A method for improving soft handover Gain, comprising:
- determining the network performance in the uplink or in the downlink, or both in the uplink and in the downlink;
- and
- measuring and tuning at least one or more of those parameters that are directly related to soft handover Gain, so as to control soft handover Gain,
- wherein, for determining the network performance in the uplink or in the downlink, or both in the uplink and in the downlink, at least one or more of the following parameters is measured, tuned or both measured and tuned:
- Power/normalized user:
- ∑
- P
- ^
-
- txTotal
- N
- norm
- ,
- where Σ{circumflex over (P)}txTotal is the sum of the transmission powers of the base transceiver stations in the cluster and Nnorm is the total normalized number of users in the cluster:
- Nnorm=Nj·(Rj/R0·EbN0,j/EbN0), where Nj is the number of users for type j traffic, R0 is the reference bitrate, Rj is the bitrate for type j, EbN0 is the reference EbNo target and EbN0,j is the target for type j;
- NoiseRise/normalized user:
- ∑
- NR
- N
- norm
- ,
- where ΣNR is the sum of the noise rises of the cells in the cluster and Nnorm is the total normalized number of users in the cluster;
- load factor/normalized user (for unlink and downlink separately):
- ∑
- LF
- N
- norm
- ,
- where load factor is the sum of the load factors of the cells in the cluster and Nnorm is the total normalized number of users in the cluster;
- QoS (Quality of Service) in terms of:
- Call Block Ratio or Blocking probability,
- Packet queuing probability,
- Call Drop Ratio.
30 more elements
A system for improving soft handover Gain comprising:
- a determining unit configured to determine the network performance in the uplink or in the downlink, or both in the uplink and in the downlink;
- and
- a measuring unit configured to measure, tune, or measure and tune at least one or more of those parameters, that are directly related to soft handover Gain, so as to control soft handover Gain,
- wherein, if the network is coverage limited, the system starts with adjusting soft handover parameters,
- wherein the soft handover parameters are 1) soft handover windowAdd, 2) windowDrop, and 3) activeSetSize.
2 more elements
An apparatus, comprising:
- means for determining the network performance in the uplink or in the downlink, or both in the uplink and in the downlink;
- and
- means for measuring, tuning or measuring and tuning at least one or more of those parameters that are directly related to soft handover Gain, so as to control soft handover Gain,
- wherein, if the network is coverage limited, the apparatus starts with adjusting soft handover parameters,
- wherein the soft handover parameters are 1) soft handover windowAdd, 2) windowDrop, and 3) activeSetSize.
2 more elements
An apparatus improving soft handover Gain, comprising:
- determining means for determining the network performance in the uplink or in the downlink, or both in the uplink and in the downlink;
- and
- measuring means for measuring and tuning at least one or more of those parameters that are directly related to soft handover Gain, so as to control soft handover Gain,
- wherein, for determining the network performance in the uplink or in the downlink, or both in the uplink and in the downlink, at least one or more of the following parameters is measured, tuned or both measured and tuned:
- Power/normalized user:
- ∑
- P
- ^
-
- txTotal
- N
- norm
- ,
- where Σ{circumflex over (P)}txTotal is the sum of the transmission powers of the base transceiver stations in the cluster and Nnorm is the total normalized number of users in the cluster:
- Nnorm=Nj·(Rj/R0·EbN0,j/EbN0), where Nj is the number of users for type j traffic, R0 is the reference bitrate, Rj is the bitrate for type j, EbN0 is the reference EbNo target and EbN0,j is the target for type j;
- NoiseRise/normalized user:
- ∑
- NR
- N
- norm
- ,
- where ΣNR is the sum of the noise rises of the cells in the cluster and Nnorm is the total normalized number of users in the cluster;
- load factor/normalized user (for unlink and downlink separately):
- ∑
- LF
- N
- norm
- ,
- where load factor is the sum of the load factors of the cells in the cluster and Nnorm is the total normalized number of users in the cluster;
- QoS (Quality of Service) in terms of:
- Call Block Ratio or Blocking probability,
- Packet queuing probability,
- Call Drop Ratio.
30 more elements
Dependencies are inferred from the claim text.