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Wireless Broadband Planning & Design
LTE Coverage & Capacity Dimensioning Modul 4
1
Outline
Frequency Bands and Typical deployment areas Layer 1 Peak Bit Rates Terminal Categories Reference Sensitivity Link Budgets Propagation model Uplink link budget Downlink link budgets Comparison between GSM/HSPA/LTE Latency LTE Refarming to GSM Spectrum 2
Introduction
Performance evaluation : LTE capabilities from the end ’s and from the operator’s point of view The operator is interested in the network efficiency:
how many customers can be served, how much data can be provided and how many base station sites are required.
The end application performance depends on :
available bit rate, latency and seamless mobility
Page 3
Layer 1 Data Rate
Page 4
Layer 1 Data Rate - Downlink
Page 5
Layer 1 Data Rate - Uplink
Page 6
Terminal Category
Page 7
Receiver Sensitivity
Page 8
Receiver Sensitivity
Page 9
Data Rate Range
Page 10
Link Budget - Radiowave Propagation
A propagation model describes the average signal propagation, and it p p g , converts the maximum allowed propagation loss to the maximum cell range. It depends on: – Environment : urban, rural, dense urban, suburban, open, forest, sea… – Distance – Frequency – atmospheric conditions – Indoor/outdoor
Examples : Free space, Walfish–Ikegami, Okumura– Hata,Longley–Rice, Lee, Young
Page 11
Radiowave Propagation
Page 12
Page 13
Uplink- Link Budget
Page 14
Uplink Parameter – Link Budget
Page 15
Uplink Parameter – Link Budget
Page 16
Uplink Parameter – Link Budget
Page 17
Downlink Parameter – Link Budget
Page 18
Downlink Parameter – Link Budget
Page 19
Downlink Parameter – Link Budget
Page 20
MPL Comparisons
Page 21
Link budgets Comparison GSM/HSPA/LTE
The LTE link budget in downlink has several similarities with HSPA and the maximum path loss is similar. The uplink part has some differences: smaller interference margin in LTE, no macro diversity gain in LTE and no fast fading margin in LTE. The link budgets show that LTE can be deployed using existing GSM and HSPA sites assuming that the same frequency is used for LTE as for GSM and HSPA. LTE itself does not provide any major boost in the coverage. That is because the transmission power levels and the RF noise figures are also similar in GSM and HSPA technologies, and the link performance at low data rates is not much different in LTE than in HSPA. The link budget was calculated for 64 kbps uplink, which is likely not a high enough data rate for true broadband service. If we want to guarantee higher data rates in LTE, we may need low frequency deployment, additional sites, active antenna solutions or local area solutions.
Page 22
Cell Ranges Comparisons
Page 23
900 MHz vs. 2600 MHz
Page 24
Latency Delay Budget
Page 25
LTE Refarming to GSM Spectrum
LTE could be deployed in the existing GSM spectrum like 900 MHz or 1800 MHz. The flexible LTE bandwidth makes refarming easier than with WCDMA because LTE can start with 1.4 MHz or 3.0 MHz bandwidths and then grow later when the GSM traffic has decreased.
Page 26
Interference coordination
Page 27
Sub-channel Strategy
Page 28
Dimensioning Capacity ‐ Traffic volume based approach
Page 29
Dimensioning Capacity ‐ Data rate based approach
Page 30
Wireless Broadband Planning & Design
End of Section 4 LTE Coverage & Capacity Dimensioning
LTE Coverage & Capacity Dimensioning Modul 4
1
Outline
Frequency Bands and Typical deployment areas Layer 1 Peak Bit Rates Terminal Categories Reference Sensitivity Link Budgets Propagation model Uplink link budget Downlink link budgets Comparison between GSM/HSPA/LTE Latency LTE Refarming to GSM Spectrum 2
Introduction
Performance evaluation : LTE capabilities from the end ’s and from the operator’s point of view The operator is interested in the network efficiency:
how many customers can be served, how much data can be provided and how many base station sites are required.
The end application performance depends on :
available bit rate, latency and seamless mobility
Page 3
Layer 1 Data Rate
Page 4
Layer 1 Data Rate - Downlink
Page 5
Layer 1 Data Rate - Uplink
Page 6
Terminal Category
Page 7
Receiver Sensitivity
Page 8
Receiver Sensitivity
Page 9
Data Rate Range
Page 10
Link Budget - Radiowave Propagation
A propagation model describes the average signal propagation, and it p p g , converts the maximum allowed propagation loss to the maximum cell range. It depends on: – Environment : urban, rural, dense urban, suburban, open, forest, sea… – Distance – Frequency – atmospheric conditions – Indoor/outdoor
Examples : Free space, Walfish–Ikegami, Okumura– Hata,Longley–Rice, Lee, Young
Page 11
Radiowave Propagation
Page 12
Page 13
Uplink- Link Budget
Page 14
Uplink Parameter – Link Budget
Page 15
Uplink Parameter – Link Budget
Page 16
Uplink Parameter – Link Budget
Page 17
Downlink Parameter – Link Budget
Page 18
Downlink Parameter – Link Budget
Page 19
Downlink Parameter – Link Budget
Page 20
MPL Comparisons
Page 21
Link budgets Comparison GSM/HSPA/LTE
The LTE link budget in downlink has several similarities with HSPA and the maximum path loss is similar. The uplink part has some differences: smaller interference margin in LTE, no macro diversity gain in LTE and no fast fading margin in LTE. The link budgets show that LTE can be deployed using existing GSM and HSPA sites assuming that the same frequency is used for LTE as for GSM and HSPA. LTE itself does not provide any major boost in the coverage. That is because the transmission power levels and the RF noise figures are also similar in GSM and HSPA technologies, and the link performance at low data rates is not much different in LTE than in HSPA. The link budget was calculated for 64 kbps uplink, which is likely not a high enough data rate for true broadband service. If we want to guarantee higher data rates in LTE, we may need low frequency deployment, additional sites, active antenna solutions or local area solutions.
Page 22
Cell Ranges Comparisons
Page 23
900 MHz vs. 2600 MHz
Page 24
Latency Delay Budget
Page 25
LTE Refarming to GSM Spectrum
LTE could be deployed in the existing GSM spectrum like 900 MHz or 1800 MHz. The flexible LTE bandwidth makes refarming easier than with WCDMA because LTE can start with 1.4 MHz or 3.0 MHz bandwidths and then grow later when the GSM traffic has decreased.
Page 26
Interference coordination
Page 27
Sub-channel Strategy
Page 28
Dimensioning Capacity ‐ Traffic volume based approach
Page 29
Dimensioning Capacity ‐ Data rate based approach
Page 30
Wireless Broadband Planning & Design
End of Section 4 LTE Coverage & Capacity Dimensioning
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