Massive MIMO multiple input multiple output is considered as an heir of the multi user MIMO technology and it has recently gained lots of attention from both academia and industry. In 5G environment, more users using the network at the same time, CoM
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One of the most challenging issues for future wireless communication systems is the provision of quality of service QoS guarantees to users over the harsh wireless channels given the limited resource availability. The aim of this paper is to probe th
Guidelines for HSDPA troubleshooting using Actix AnalyzerFull description
With the Knowledge of Networking security, we can implement a Project in the field of Information Sharing, Resource Sharing and Application Sharing. These are all implementing with the standard of IEEE.
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HSDPA Throughput Optimization
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HSDPA Code Resource Allocation
Channelization codes are constant resource consisting of the following three parts 1. channelization codes for HS-PDSCH 2. channelization codes for Common channels and HS-SCCH HS -SCCH 3. channelization codes for DPCH The resources are reserved for the common channels and the HS-SCCH. The parameter of the codes reserved for the HS-SCCH can be configured configured.. The codes of the HS-PDSCH physical channel can be allocated in three ways :
Static HS-SCCH code allocation Spreading factor = 128 allocate with common channel
RNC Controlled dynamic allocation
In the RNC-controlled dynamic allocation, the RNC adjusts the reserved HSPDSCH codes according to the real-time usage status of the codes Configure the maximum and minimum numbers of codes available for HS-PDSCH on the RNC LMT. The codes between the two parameters are called shared codes The RNC periodically monitors how the code resource is used and decides to extend or reduce the codes reserved for the HS-PDSCH
When allocating the code resource triggered by radio link setup or radio link deletion, the RNC will extend the codes reserved for the HS-PDSCH if the following cases are fulfilled: If in cell's code tree there is at least one code can be reserved and this code's SF is equal to or less than the Cell SF reserved threshold, NodeB will try to increase HS-PDSCH code number Among shared codes, the code which neighbors to the reserved codes for the HSPDSCH is idle, which can be attained by reshuffling the cell code resource
the solid represent the occupied codes and the circles represent the idle codes Reducing the Codes Reserved for HS-PDSCH When allocating the code resources triggered by radio link setup, the RNC will reallocate one of the shared codes reserved for HS-PDSCH to DPCH if the minimum SF among free codes is larger than the Cell SF reserved threshold. The code number of the reallocated code should be the minimum.
the solid represent the occupied codes and the circles represent the idle codes The code number for HS-SCCH is parameter sets the number of HS-SCCH codes available in a cell and can be set from 1 to 15 Parameter Alocate code mode can used to choose the mode of allocating HSPDSCH codes in the RNC, there are two mode, static and dynamic The number of HS-PDSCH codes available in cell can be added from 1 - 15 codes, and only when allocate code mode is set to manual. If the allocate code mode is set to automatic, the parameter maximum number of HS-PDSCH codes in a cell can set.
NodeB - Controlled dynamic allocation
NodeB-controlled dynamic allocation allows the NodeB to use the HS-PDSCH codes that are statically allocated by the RNC. Besides, the NodeB can dynamically allocate the idle codes of the current cell to the HS-PDSCH channel The NodeB periodically detects the SF16 codes apart from the RNC-allocated HSPDSCH codes every 2 ms. If the codes or sub-codes are allocated by the RNC to the DCH or common channels, they are identified as occupied. Otherwise, they are identified as unoccupied. Therefore, the HS-PDSCH codes available for the HS-PDSCH channel include the codes allocated by the RNC and those consecutive and unoccupied SF16 codes NodeB-controlled dynamic allocation For example, if the RNC allocates five codes to the NodeB, that is, No.11 to 15 SF16 codes are allocated to the HS-PDSCH. Suppose in a 2 ms TTI, No. 0 to 5 SF16 codes are allocated to the DCH and common channels. No. 0 to 5 SF16 codes are occupied. Therefore, in the current TTI, the HS-PDSCH can use No. 6 to 15 SF16 codes If the DCH codes allocated by the RNC are temporarily occupied by the HS-PDSCH during the setup of radio links, the NBAP message returned to the RNC indicates that the radio link is set up successfully. From the next 2 ms TTI, the HS-PDSCH no longer uses these codes until they are released from the DCH
